Heat Pump Living Room Warm But Rest of House Cold — Kent Bungalow

Detached Bungalow in Kent Living Room Warm, Rest of House Cold

A homeowner in Kent contacted us after struggling with uneven temperatures throughout their bungalow in the months following a heat pump installation. The living room would become very warm quite quickly after the heating came on, but the rest of the property particularly the bedrooms and the hallway remained noticeably colder for long periods. As a result, the homeowner kept increasing the target thermostat temperature in an attempt to push more heat to the colder areas, which was causing the heat pump to run for longer and less efficiently than it should have been.

What We Found

After discussing in detail how the system was operating day to day, we identified that the main room thermostat had been positioned inside the living room itself. Because the living room heated up significantly faster than the rest of the property likely due to its size, aspect, and the volume of glazing the thermostat was reaching its target temperature too quickly and signalling the system to shut the heating down before the bedrooms and hallway had properly warmed up. The heat pump was not faulty. The equipment was working exactly as designed. The problem was that the thermostat was telling it the house was warm when only one room was.

This is a very common issue on heat pump systems and one we see regularly across UK properties. It tends to affect open-plan spaces, south-facing rooms, and any room that benefits from direct solar gain during the day. The problem is less likely to occur on boiler systems because the higher flow temperatures compensate for the early shutoff but at lower heat pump flow temperatures, the effect on the rest of the property is much more noticeable. If your system is leaving parts of the house cold while one room overheats, our article on why some rooms stay cold with a heat pump covers the most common causes in detail.

What We Advised

We recommended four changes, all of which could be made without any new equipment or pipework. First, the main thermostat needed to be moved from the living room to the hallway, which is the standard recommended position for a heat pump system because it reflects the average temperature of the home rather than its warmest point. Second, the target temperature should be slightly reduced to around 19°C, allowing the heat pump to maintain a steady, lower-intensity output rather than cycling on and off in response to one fast-heating room. Third, the TRVs within the living room itself should be used to control local comfort — restricting heat to that space rather than allowing it to drive the entire system's behaviour. Fourth, all remaining radiators throughout the bungalow should be left fully open so that flow could distribute evenly across the property.

We also noted that the system did not contain either a buffer tank or a volumiser. In the absence of these components, maintaining adequate water volume in circulation is particularly important for reliable heat pump operation and for anti-freeze protection during colder periods. We carried out calculations on the existing radiator sizes throughout the bungalow and confirmed they were adequate for maintaining stable circulation and anti-freeze safeguards through winter — so no upgrades were required on that front either.

The Outcome

Following the thermostat repositioning and the control adjustments, the homeowner reported a noticeably different experience within a short period. Temperatures across the bungalow became much more even, with the bedrooms and hallway reaching comfortable levels without needing to push the thermostat higher. Overall thermostat adjustment reduced considerably. The heat pump operated more quietly and with a more stable rhythm, running longer continuous cycles rather than short bursts in response to the living room reaching temperature too quickly.

What This Case Illustrates

This case is a good example of how relatively small control and thermostat positioning issues can create significant comfort complaints on heat pump systems even when the heat pump itself, the radiators, and the pipework are all performing correctly. The equipment did not need replacing. No engineer visit to site was required. The diagnosis was reached through a structured remote review of how the system was set up and how the property actually heats room by room.

Many heat pump comfort problems across UK homes fall into exactly this category. The unit is functioning properly, but the control arrangement around it does not reflect how the building heats up in practice. If your heat pump is leaving parts of your home cold, running inconsistently, or simply not feeling as comfortable as you expected, our Full Performance Review provides independent technical analysis and practical recommendations to help identify what is happening and what can be changed. And if you are still at the planning stage, our Pre-Installation Design and Heat Loss Review helps ensure that thermostat positioning, radiator sizing, and system design are considered properly before installation begins.