Can I Add Cooling to My Existing Heat Pump?
Can I Add Cooling to My Existing Heat Pump?
Can I Add Cooling to My Existing Heat Pump?
Can I Add Cooling to My Existing Heat Pump?
Can I Add Cooling to My Existing Heat Pump?
UK Heat pump Help Technical Team
Independent Heat Pump Engineer
Can I Add Cooling to My Existing Heat Pump?
As UK summers become progressively warmer and modern, well-insulated homes become more prone to overheating, homeowners with existing heat pump systems are increasingly asking whether their heating system can do double duty and provide summer cooling as well. The answer, in many cases, is yes.
However, adding cooling to an existing heat pump is not simply a matter of enabling a setting. Whether it is possible, what it involves, and how much it costs depends on the heat pump model you have, the type of emitters installed throughout your property, and how much adaptation the controls and wiring will need to support cooling mode safely and correctly.
This guide works through each of the key questions homeowners typically ask when exploring cooling for their existing system, from checking whether the unit supports it to understanding what a properly commissioned cooling setup actually requires.
Does My Heat Pump Already Have Cooling Capability?
The first step is establishing whether your heat pump model is technically capable of operating in cooling mode at all. Many modern air source heat pumps include this capability at the hardware level from manufacture, but it is frequently left disabled or unconfigured at installation because cooling was not requested at the time. The hardware is present; it has simply never been activated.
Manufacturers whose heat pumps commonly include cooling capability include:
Vaillant aroTHERM plus
Daikin Altherma (various models check the specific variant)
LG Therma V
Mitsubishi Electric Ecodan (selected models — not all variants include cooling)
However, owning a model from this list does not mean cooling is ready to use. In the vast majority of installations, additional controls, wiring changes, and often new or modified emitters are required before cooling can function safely. The heat pump having the capability is the starting point, not the end point. Our full guide on what heat pump cooling involves and which systems support it covers the technical foundations in more detail.
What Do I Need to Add Cooling?
This depends entirely on your specific installation, which is precisely why a proper review before any work begins is essential. There is no universal answer. What is a relatively straightforward control modification in one property may require significant system changes in another.
The areas that typically need to be assessed and addressed include:
Heat pump model and firmware compatibility: Whether your specific model and its current firmware version support cooling. In some cases a controls upgrade is required before the feature is accessible.
Emitter suitability: The type of heat emitters in your home standard radiators, underfloor heating circuits, or fan coil units fundamentally determines what is feasible and what additional work is required. This is often the single most significant factor.
Dew point and condensation protection: Critical safety components that monitor the risk of condensation forming on cooled surfaces. Without proper sensors and control logic, cooling mode can cause moisture damage to floors, walls, and pipework.
Control and wiring modifications: Cooling mode typically requires either additional wiring, a new or upgraded controller, or changes to the existing control strategy to manage the transition between heating and cooling modes correctly.
System recommissioning: Once changes are made, the system must be properly commissioned specifically for cooling mode. A heating commissioning check does not cover the settings and parameters relevant to cooling.
Errors made at the commissioning stage are one of the most common sources of cooling system problems. Our guide on common commissioning mistakes with heat pump installations is relevant reading for anyone considering system modifications, since many of the same principles apply.
Can I Use My Existing Radiators for Cooling?
In the vast majority of UK domestic installations, standard radiators are not suitable for cooling mode. There are two fundamental reasons for this.
The first is condensation. When cool water circulates through a radiator, the metal surface can fall below the dew point temperature of the indoor air. At that point, moisture condenses on the outer surface of the radiator and drips. In a room with carpets, engineered timber, or adjacent plasterwork, the cumulative moisture damage over a cooling season can be significant.
The second reason is limited effectiveness. Radiators are designed with heating in mind. Their surface area calculations, fin geometry, and positioning are all optimised for distributing warm air upward by convection. In cooling mode, they perform far less efficiently, and the resulting cooling effect is typically insufficient to meaningfully reduce room temperature.
There are specialist emitters designed for reversible heating and cooling operation. Fan-assisted radiators and dedicated heating and cooling wall units can work effectively, but they replace existing radiators rather than supplement them. Our article on whether heat pumps need bigger radiators explains how emitter output relates to water temperature, which directly affects cooling performance as well as heating.
Can My Underfloor Heating Be Used for Cooling?
Underfloor cooling is genuinely effective in modern, well-insulated properties, and it is the most common emitter approach for reversible heat pump cooling in the UK. Rather than circulating cold air, it works by gently reducing the floor surface temperature. The cooled floor then absorbs heat from the room above, gradually lowering the ambient temperature throughout the day.
The effect is subtle. Underfloor cooling will not deliver the rapid temperature drops possible with conventional air conditioning, but in a well-insulated home it can make a significant difference to comfort, particularly overnight when the building’s thermal mass retains the lower temperature accumulated during the day.
However, underfloor cooling must never be enabled without the correct protections in place. The risks of getting this wrong are not trivial. A properly set-up underfloor cooling system requires:
Dew point sensor: A sensor positioned on the return pipe that measures the risk of condensation and prevents the system from cooling the floor surface below the safe threshold for the current air conditions.
Condensation monitoring controls: A control system that responds dynamically to indoor humidity and outdoor temperature changes, modifying or stopping cooling automatically before condensation risk develops.
Correct flow temperature setpoints for cooling mode: The floor surface temperature must stay consistently above the calculated dew point of the indoor air throughout the cooling period.
Full recommissioning for cooling: The system must be set up and tested specifically in cooling mode, not simply assumed to be correct because it was commissioned correctly for heating.
Without these safeguards, condensation can form within the floor construction, saturating the screed and potentially causing damage to flooring material, subfloor structure, and adjacent walls. Damage of this nature may not become visible until weeks or months after the problem has been developing.
Do I Need Fan Coil Units?
If you want cooling that produces a noticeably quicker temperature reduction something closer in experience to conventional air conditioning fan coil units are usually the most practical route. They connect to the heat pump water circuit in the same way as radiators or underfloor heating, but use a built-in fan to force room air across a cooling coil inside the unit, actively and quickly removing heat from the space.
Unlike standard radiators, fan coil units are designed specifically for reversible heating and cooling operation. They include a condensate drain to manage the moisture that forms during cooling and handle the thermodynamic demands of both modes effectively. They also respond considerably faster than underfloor heating, making them better suited to spaces that need to be cooled quickly.
Fan coil units are particularly appropriate for:
South-facing or south-west-facing rooms that receive strong direct sunlight throughout the day and become uncomfortably warm during summer
Loft conversions and top-floor bedrooms that trap heat and are difficult to cool passively, where temperature regularly affects sleep quality
Modern, highly insulated new-build properties that retain heat efficiently in summer as well as winter
Properties with large areas of glazing, bi-fold doors, or significant south-facing windows where solar gain makes comfortable temperatures difficult to maintain
Fan coil units can also be integrated alongside underfloor heating. In a mixed installation, the underfloor circuits provide the gentle background cooling on ground-floor areas while fan coil units deliver stronger cooling in specific rooms that need it. Each circuit or unit can be controlled independently, giving homeowners meaningful flexibility. Our article on whether heat pumps need multiple heating zones explains the principles of heat pump zoning, which apply equally to cooling circuit design.
Will Adding Cooling Damage My Heat Pump?
No, provided the system is properly designed and correctly commissioned. Modern heat pumps that support cooling are built to operate in both directions. The refrigerant cycle handles the reversal without stress to the compressor or heat exchanger, and the unit runs at comparable efficiency to heating operation under equivalent load conditions.
The risks that genuinely exist are not in the heat pump itself but in the system surrounding it. Condensation damage from inadequately protected emitters, incorrect control settings causing the system to overcool, and poor commissioning that leaves cooling-mode parameters incorrectly configured are all real failure modes. Every one of them is a system or installation issue, not a heat pump hardware issue.
A heat pump running in cooling mode does not draw substantially more electricity than in heating mode at equivalent loads. With good emitter design and correct settings, operational costs for summer cooling are typically modest for a property that is already insulated to modern standards.
How Much Does It Cost to Add Cooling?
Costs vary significantly depending on the starting point. For installations where the heat pump already supports cooling and the emitters are underfloor heating throughout, enabling cooling may require only controls, dew point sensors, and recommissioning. In those cases, total costs typically fall in the range of £600 to £1,800, depending on the controls specified and how much of the work can be done remotely versus on site.
Where fan coil units are required, costs increase substantially. Each unit including supply and installation typically falls between £900 and £2,800, depending on specification, room accessibility, and the complexity of the pipework and electrical connections. A property requiring fan coil units in three rooms could reasonably involve total costs of between £3,500 and £9,000 or more. Installations involving a mix of underfloor cooling on lower floors and fan coil units upstairs sit somewhere between these.
Because every installation is genuinely different, a meaningful estimate requires a proper review of your specific system before any work begins. Homeowners who understand the full picture before starting are consistently better positioned to make cost-effective decisions. Our guide on whether heat pumps are worth it in the UK covers the broader cost and value questions for heat pump ownership, including how additional features such as cooling factor into the overall domestic energy picture.
Adding Cooling to an Existing Heat Pump: The Process Step by Step
Understanding the typical sequence of work before starting helps homeowners plan realistically and avoid surprises. While every installation is different, the standard route to enabling cooling on an existing heat pump follows this process:
Confirm your heat pump model and firmware version support cooling mode not every model from a cooling-capable manufacturer includes reversible operation, and some require a firmware update before the feature is accessible.
Have a remote or on-site system review carried out this identifies which emitters are suitable, what controls and sensors are required, whether dew point protection is needed, and whether any wiring changes are necessary.
Install the required controls, dew point sensors, and condensation protection these are the safety systems that prevent condensation damage to floors and walls. They must be installed before cooling is tested.
Carry out any electrical modifications with a qualified electrician wiring changes to enable cooling mode are completed following a diagram specific to your installation.
Commission the system specifically for cooling mode settings, setpoints, and sensor calibration are all carried out and tested under real conditions before the work is signed off.
Straightforward installations involving only controls and sensors can often be completed within one to two days. Properties requiring new fan coil units, additional pipework, or more extensive rewiring will take longer and may involve multiple visits.
Radiators, Underfloor Heating, or Fan Coil Units: Which Is Right for You?
The type of emitters already installed in your home is the single most important factor in determining which cooling approach is practical. Here is a clear summary of each option:
Standard radiators are not suitable for cooling in the vast majority of UK homes. The condensation risk is too high and the cooling effect too limited to justify the setup. The only exception is specialist fan-assisted heating and cooling emitter units, which replace existing radiators and handle both modes safely but at a meaningful cost per unit.
Underfloor heating is the most natural fit for heat pump cooling in modern, well-insulated homes. It provides gentle, distributed cooling without any visible hardware changes. Subject to dew point protection being properly installed and commissioned, it is the most seamless and comfortable form of heat pump cooling available. Best suited to homes with underfloor heating across most or all of the ground floor.
Fan coil units offer the most active and controllable cooling performance, particularly in specific rooms with high heat gain. They can be installed in homes with any existing emitter setup, work efficiently in both heating and cooling modes, and handle condensation through a built-in drain. Higher upfront cost per unit than enabling underfloor cooling, but they deliver a stronger and faster temperature response.
Frequently Asked Questions
Can I add cooling to any air source heat pump?
No. Cooling capability depends on the specific heat pump model and, in some cases, the installed firmware version. Many modern air source heat pumps do include it, but older models, simpler single-function units, and some budget products do not. The first step is always confirming your specific model’s capabilities directly with the manufacturer or a qualified technical reviewer.
Do I need planning permission to add cooling to my existing heat pump?
In most cases, no. Enabling cooling on an existing heat pump does not involve installing new external equipment and therefore does not trigger planning permission requirements in most UK properties. However, if the work involves adding external fan coil units or visible external hardware changes, it is worth checking with your local planning authority, particularly for listed buildings or properties in conservation areas.
How long does it take to add cooling to a heat pump?
For installations requiring only controls, sensors, and recommissioning, the work can typically be completed in one to two days. Installations requiring new fan coil units, additional pipework, or extensive rewiring will involve additional time, often spread across more than one visit depending on the scope.
What is the difference between heat pump cooling and conventional air conditioning?
Heat pump cooling circulates cooled water through existing emitters underfloor circuits or fan coil units — rather than delivering cold air directly to each room. It works within your existing heating system rather than requiring a separate refrigerant circuit. The result is generally gentler and less intrusive than conventional air conditioning, but with a lower maximum cooling capacity in most residential settings. Fan coil units connected to a heat pump come closer to the air conditioning experience than underfloor cooling.
Will heat pump cooling make my home as cool as air conditioning?
Not to the same degree, particularly with underfloor cooling. The objective of heat pump cooling in most UK homes is comfort and thermal management rather than reaching low temperatures quickly. A well-designed system can typically reduce room temperatures by three to six degrees over the course of a day, which makes a significant difference to liveability during warm spells. For more active cooling, fan coil units deliver a stronger effect than underfloor circuits.
Is heat pump cooling suitable for older properties?
Older properties can use heat pump cooling, but they present specific challenges. Properties with solid floors, stone flags, or timber board floors require careful assessment before underfloor cooling is considered, since these materials carry higher condensation risk than modern screed. Older properties also tend to have radiators rather than underfloor heating, making fan coil units the more practical cooling path in most cases. The feasibility of each option depends on the specific construction of the property.
Need Help Working Out What Is Possible?
If you are unsure whether your heat pump can support cooling, or want to understand what enabling it would involve on your specific installation, we can help through a remote review of your system. There is no need for a site visit to establish the key facts.
Through our remote consultation service, we can provide:
Confirmation of whether your heat pump model supports cooling and what version of controls you need
An honest assessment of your existing emitters and which rooms or circuits are realistic cooling candidates
A clear explanation of the controls, wiring, sensors, and dew point protection that would be required for safe operation
Bespoke wiring diagrams specific to your installation, ready to hand to your electrician or installer
Technical guidance and support working alongside your chosen installer to implement cooling correctly and safely
To find out exactly what is possible with your system, use our Fix My Heat Pump remote consultation service. We will review your setup, confirm what cooling would require, and give you an honest picture of whether it is a practical option for your home.
Can I Add Cooling to My Existing Heat Pump?
As UK summers become progressively warmer and modern, well-insulated homes become more prone to overheating, homeowners with existing heat pump systems are increasingly asking whether their heating system can do double duty and provide summer cooling as well. The answer, in many cases, is yes.
However, adding cooling to an existing heat pump is not simply a matter of enabling a setting. Whether it is possible, what it involves, and how much it costs depends on the heat pump model you have, the type of emitters installed throughout your property, and how much adaptation the controls and wiring will need to support cooling mode safely and correctly.
This guide works through each of the key questions homeowners typically ask when exploring cooling for their existing system, from checking whether the unit supports it to understanding what a properly commissioned cooling setup actually requires.
Does My Heat Pump Already Have Cooling Capability?
The first step is establishing whether your heat pump model is technically capable of operating in cooling mode at all. Many modern air source heat pumps include this capability at the hardware level from manufacture, but it is frequently left disabled or unconfigured at installation because cooling was not requested at the time. The hardware is present; it has simply never been activated.
Manufacturers whose heat pumps commonly include cooling capability include:
Vaillant aroTHERM plus
Daikin Altherma (various models check the specific variant)
LG Therma V
Mitsubishi Electric Ecodan (selected models — not all variants include cooling)
However, owning a model from this list does not mean cooling is ready to use. In the vast majority of installations, additional controls, wiring changes, and often new or modified emitters are required before cooling can function safely. The heat pump having the capability is the starting point, not the end point. Our full guide on what heat pump cooling involves and which systems support it covers the technical foundations in more detail.
What Do I Need to Add Cooling?
This depends entirely on your specific installation, which is precisely why a proper review before any work begins is essential. There is no universal answer. What is a relatively straightforward control modification in one property may require significant system changes in another.
The areas that typically need to be assessed and addressed include:
Heat pump model and firmware compatibility: Whether your specific model and its current firmware version support cooling. In some cases a controls upgrade is required before the feature is accessible.
Emitter suitability: The type of heat emitters in your home standard radiators, underfloor heating circuits, or fan coil units fundamentally determines what is feasible and what additional work is required. This is often the single most significant factor.
Dew point and condensation protection: Critical safety components that monitor the risk of condensation forming on cooled surfaces. Without proper sensors and control logic, cooling mode can cause moisture damage to floors, walls, and pipework.
Control and wiring modifications: Cooling mode typically requires either additional wiring, a new or upgraded controller, or changes to the existing control strategy to manage the transition between heating and cooling modes correctly.
System recommissioning: Once changes are made, the system must be properly commissioned specifically for cooling mode. A heating commissioning check does not cover the settings and parameters relevant to cooling.
Errors made at the commissioning stage are one of the most common sources of cooling system problems. Our guide on common commissioning mistakes with heat pump installations is relevant reading for anyone considering system modifications, since many of the same principles apply.
Can I Use My Existing Radiators for Cooling?
In the vast majority of UK domestic installations, standard radiators are not suitable for cooling mode. There are two fundamental reasons for this.
The first is condensation. When cool water circulates through a radiator, the metal surface can fall below the dew point temperature of the indoor air. At that point, moisture condenses on the outer surface of the radiator and drips. In a room with carpets, engineered timber, or adjacent plasterwork, the cumulative moisture damage over a cooling season can be significant.
The second reason is limited effectiveness. Radiators are designed with heating in mind. Their surface area calculations, fin geometry, and positioning are all optimised for distributing warm air upward by convection. In cooling mode, they perform far less efficiently, and the resulting cooling effect is typically insufficient to meaningfully reduce room temperature.
There are specialist emitters designed for reversible heating and cooling operation. Fan-assisted radiators and dedicated heating and cooling wall units can work effectively, but they replace existing radiators rather than supplement them. Our article on whether heat pumps need bigger radiators explains how emitter output relates to water temperature, which directly affects cooling performance as well as heating.
Can My Underfloor Heating Be Used for Cooling?
Underfloor cooling is genuinely effective in modern, well-insulated properties, and it is the most common emitter approach for reversible heat pump cooling in the UK. Rather than circulating cold air, it works by gently reducing the floor surface temperature. The cooled floor then absorbs heat from the room above, gradually lowering the ambient temperature throughout the day.
The effect is subtle. Underfloor cooling will not deliver the rapid temperature drops possible with conventional air conditioning, but in a well-insulated home it can make a significant difference to comfort, particularly overnight when the building’s thermal mass retains the lower temperature accumulated during the day.
However, underfloor cooling must never be enabled without the correct protections in place. The risks of getting this wrong are not trivial. A properly set-up underfloor cooling system requires:
Dew point sensor: A sensor positioned on the return pipe that measures the risk of condensation and prevents the system from cooling the floor surface below the safe threshold for the current air conditions.
Condensation monitoring controls: A control system that responds dynamically to indoor humidity and outdoor temperature changes, modifying or stopping cooling automatically before condensation risk develops.
Correct flow temperature setpoints for cooling mode: The floor surface temperature must stay consistently above the calculated dew point of the indoor air throughout the cooling period.
Full recommissioning for cooling: The system must be set up and tested specifically in cooling mode, not simply assumed to be correct because it was commissioned correctly for heating.
Without these safeguards, condensation can form within the floor construction, saturating the screed and potentially causing damage to flooring material, subfloor structure, and adjacent walls. Damage of this nature may not become visible until weeks or months after the problem has been developing.
Do I Need Fan Coil Units?
If you want cooling that produces a noticeably quicker temperature reduction something closer in experience to conventional air conditioning fan coil units are usually the most practical route. They connect to the heat pump water circuit in the same way as radiators or underfloor heating, but use a built-in fan to force room air across a cooling coil inside the unit, actively and quickly removing heat from the space.
Unlike standard radiators, fan coil units are designed specifically for reversible heating and cooling operation. They include a condensate drain to manage the moisture that forms during cooling and handle the thermodynamic demands of both modes effectively. They also respond considerably faster than underfloor heating, making them better suited to spaces that need to be cooled quickly.
Fan coil units are particularly appropriate for:
South-facing or south-west-facing rooms that receive strong direct sunlight throughout the day and become uncomfortably warm during summer
Loft conversions and top-floor bedrooms that trap heat and are difficult to cool passively, where temperature regularly affects sleep quality
Modern, highly insulated new-build properties that retain heat efficiently in summer as well as winter
Properties with large areas of glazing, bi-fold doors, or significant south-facing windows where solar gain makes comfortable temperatures difficult to maintain
Fan coil units can also be integrated alongside underfloor heating. In a mixed installation, the underfloor circuits provide the gentle background cooling on ground-floor areas while fan coil units deliver stronger cooling in specific rooms that need it. Each circuit or unit can be controlled independently, giving homeowners meaningful flexibility. Our article on whether heat pumps need multiple heating zones explains the principles of heat pump zoning, which apply equally to cooling circuit design.
Will Adding Cooling Damage My Heat Pump?
No, provided the system is properly designed and correctly commissioned. Modern heat pumps that support cooling are built to operate in both directions. The refrigerant cycle handles the reversal without stress to the compressor or heat exchanger, and the unit runs at comparable efficiency to heating operation under equivalent load conditions.
The risks that genuinely exist are not in the heat pump itself but in the system surrounding it. Condensation damage from inadequately protected emitters, incorrect control settings causing the system to overcool, and poor commissioning that leaves cooling-mode parameters incorrectly configured are all real failure modes. Every one of them is a system or installation issue, not a heat pump hardware issue.
A heat pump running in cooling mode does not draw substantially more electricity than in heating mode at equivalent loads. With good emitter design and correct settings, operational costs for summer cooling are typically modest for a property that is already insulated to modern standards.
How Much Does It Cost to Add Cooling?
Costs vary significantly depending on the starting point. For installations where the heat pump already supports cooling and the emitters are underfloor heating throughout, enabling cooling may require only controls, dew point sensors, and recommissioning. In those cases, total costs typically fall in the range of £600 to £1,800, depending on the controls specified and how much of the work can be done remotely versus on site.
Where fan coil units are required, costs increase substantially. Each unit including supply and installation typically falls between £900 and £2,800, depending on specification, room accessibility, and the complexity of the pipework and electrical connections. A property requiring fan coil units in three rooms could reasonably involve total costs of between £3,500 and £9,000 or more. Installations involving a mix of underfloor cooling on lower floors and fan coil units upstairs sit somewhere between these.
Because every installation is genuinely different, a meaningful estimate requires a proper review of your specific system before any work begins. Homeowners who understand the full picture before starting are consistently better positioned to make cost-effective decisions. Our guide on whether heat pumps are worth it in the UK covers the broader cost and value questions for heat pump ownership, including how additional features such as cooling factor into the overall domestic energy picture.
Adding Cooling to an Existing Heat Pump: The Process Step by Step
Understanding the typical sequence of work before starting helps homeowners plan realistically and avoid surprises. While every installation is different, the standard route to enabling cooling on an existing heat pump follows this process:
Confirm your heat pump model and firmware version support cooling mode not every model from a cooling-capable manufacturer includes reversible operation, and some require a firmware update before the feature is accessible.
Have a remote or on-site system review carried out this identifies which emitters are suitable, what controls and sensors are required, whether dew point protection is needed, and whether any wiring changes are necessary.
Install the required controls, dew point sensors, and condensation protection these are the safety systems that prevent condensation damage to floors and walls. They must be installed before cooling is tested.
Carry out any electrical modifications with a qualified electrician wiring changes to enable cooling mode are completed following a diagram specific to your installation.
Commission the system specifically for cooling mode settings, setpoints, and sensor calibration are all carried out and tested under real conditions before the work is signed off.
Straightforward installations involving only controls and sensors can often be completed within one to two days. Properties requiring new fan coil units, additional pipework, or more extensive rewiring will take longer and may involve multiple visits.
Radiators, Underfloor Heating, or Fan Coil Units: Which Is Right for You?
The type of emitters already installed in your home is the single most important factor in determining which cooling approach is practical. Here is a clear summary of each option:
Standard radiators are not suitable for cooling in the vast majority of UK homes. The condensation risk is too high and the cooling effect too limited to justify the setup. The only exception is specialist fan-assisted heating and cooling emitter units, which replace existing radiators and handle both modes safely but at a meaningful cost per unit.
Underfloor heating is the most natural fit for heat pump cooling in modern, well-insulated homes. It provides gentle, distributed cooling without any visible hardware changes. Subject to dew point protection being properly installed and commissioned, it is the most seamless and comfortable form of heat pump cooling available. Best suited to homes with underfloor heating across most or all of the ground floor.
Fan coil units offer the most active and controllable cooling performance, particularly in specific rooms with high heat gain. They can be installed in homes with any existing emitter setup, work efficiently in both heating and cooling modes, and handle condensation through a built-in drain. Higher upfront cost per unit than enabling underfloor cooling, but they deliver a stronger and faster temperature response.
Frequently Asked Questions
Can I add cooling to any air source heat pump?
No. Cooling capability depends on the specific heat pump model and, in some cases, the installed firmware version. Many modern air source heat pumps do include it, but older models, simpler single-function units, and some budget products do not. The first step is always confirming your specific model’s capabilities directly with the manufacturer or a qualified technical reviewer.
Do I need planning permission to add cooling to my existing heat pump?
In most cases, no. Enabling cooling on an existing heat pump does not involve installing new external equipment and therefore does not trigger planning permission requirements in most UK properties. However, if the work involves adding external fan coil units or visible external hardware changes, it is worth checking with your local planning authority, particularly for listed buildings or properties in conservation areas.
How long does it take to add cooling to a heat pump?
For installations requiring only controls, sensors, and recommissioning, the work can typically be completed in one to two days. Installations requiring new fan coil units, additional pipework, or extensive rewiring will involve additional time, often spread across more than one visit depending on the scope.
What is the difference between heat pump cooling and conventional air conditioning?
Heat pump cooling circulates cooled water through existing emitters underfloor circuits or fan coil units — rather than delivering cold air directly to each room. It works within your existing heating system rather than requiring a separate refrigerant circuit. The result is generally gentler and less intrusive than conventional air conditioning, but with a lower maximum cooling capacity in most residential settings. Fan coil units connected to a heat pump come closer to the air conditioning experience than underfloor cooling.
Will heat pump cooling make my home as cool as air conditioning?
Not to the same degree, particularly with underfloor cooling. The objective of heat pump cooling in most UK homes is comfort and thermal management rather than reaching low temperatures quickly. A well-designed system can typically reduce room temperatures by three to six degrees over the course of a day, which makes a significant difference to liveability during warm spells. For more active cooling, fan coil units deliver a stronger effect than underfloor circuits.
Is heat pump cooling suitable for older properties?
Older properties can use heat pump cooling, but they present specific challenges. Properties with solid floors, stone flags, or timber board floors require careful assessment before underfloor cooling is considered, since these materials carry higher condensation risk than modern screed. Older properties also tend to have radiators rather than underfloor heating, making fan coil units the more practical cooling path in most cases. The feasibility of each option depends on the specific construction of the property.
Need Help Working Out What Is Possible?
If you are unsure whether your heat pump can support cooling, or want to understand what enabling it would involve on your specific installation, we can help through a remote review of your system. There is no need for a site visit to establish the key facts.
Through our remote consultation service, we can provide:
Confirmation of whether your heat pump model supports cooling and what version of controls you need
An honest assessment of your existing emitters and which rooms or circuits are realistic cooling candidates
A clear explanation of the controls, wiring, sensors, and dew point protection that would be required for safe operation
Bespoke wiring diagrams specific to your installation, ready to hand to your electrician or installer
Technical guidance and support working alongside your chosen installer to implement cooling correctly and safely
To find out exactly what is possible with your system, use our Fix My Heat Pump remote consultation service. We will review your setup, confirm what cooling would require, and give you an honest picture of whether it is a practical option for your home.
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If you're unsure whether your heat pump problem can be diagnosed remotely, send us a short description of the issue and we’ll let you know if a technical review is worthwhile. No obligation.
If you're unsure whether your heat pump problem can be diagnosed remotely, send us a short description of the issue and we’ll let you know if a technical review is worthwhile. No obligation.
