Why do I have to turn my heating up so high to feel warm?

What this usually means

Comfort is not just about air temperature; it is about the balance of heat your body gains and loses. When you sit in a room with cold walls, windows and floors, your body radiates heat to those cold surfaces and you feel cold even if the air is at a normal temperature. To compensate, you push the thermostat higher to overheat the air, trying to offset the chill from the surfaces. So the need to 'turn it right up' is often a sign of cold surfaces — poor insulation and thermal bridges — rather than insufficient heating.

The other half is the rate of heat loss. A poorly insulated, draughty home loses heat through its walls, roof, floor and gaps almost as fast as the heating supplies it, so the room only reaches comfort when the system runs hard and the thermostat is high — and it cools quickly the moment the heating drops. You are effectively heating against a leak. The boiler or heat pump may be perfectly capable; it is simply being asked to replace heat that is escaping continuously, which is why the setting has to be so high and the bills so large.

Both point to the same conclusion: the fix is to reduce the heat loss and warm the surfaces, not to keep overheating the air. Insulating walls, roof and floors raises the surface temperatures so you feel warm without overheating the air, and reduces the rate of loss so the home holds its warmth at a normal setting. Sealing air leakage stops the draughts and heat escaping. Once the fabric is improved, a comfortable home typically needs the thermostat only around 19–21°C — and stays warm there — instead of being turned up high and still feeling cold.

Common causes

Signs and symptoms

Human thermal comfort depends on both air temperature and the mean radiant temperature of the surrounding surfaces. The body exchanges heat by radiation with walls, windows and floors, so when those surfaces are cold, the body loses heat to them and feels cold regardless of the air temperature. Raising the air temperature with the thermostat partially compensates by warming the air the body convects to, but it is an inefficient substitute for warm surfaces, which is why a room with cold walls feels chilly even when the thermostat reads a normal figure.

The rate at which a home loses heat sets how hard the heating must work to maintain any temperature. Fabric heat loss (area × U-value × temperature difference) and air-leakage loss together determine the steady heat input needed; in a poorly insulated, leaky home this is large, so comfort is only reached with the system running hard and the set point high, and the home cools rapidly when input falls. Improving insulation lowers the U-values and the loss, and sealing leakage cuts the air-change loss, so the same comfort is achieved with far less input at a lower set point.

Insulation also raises internal surface temperatures, which improves comfort directly. A well-insulated wall has a warmer inner surface, so the radiant exchange with the body is gentler and the room feels warm at a lower air temperature — often allowing the thermostat to be set several degrees lower for the same comfort, with corresponding energy savings, since heat loss is proportional to the indoor-outdoor temperature difference. The investigation-first approach measures where the heat is lost and where surfaces are cold, so the fabric can be improved to deliver comfort at a normal, economical setting rather than by perpetually overheating the air.

How to feel warm at a normal setting

Reduce the heat loss and warm the surfaces rather than overheating the air. Measure where heat escapes, insulate and air-seal, and the home will feel warm at a normal, affordable thermostat setting.

1. 01

   Measure where heat escapes

   Use thermal imaging and a blower door test to find the heat loss and cold surfaces driving the high setting.

2. 02

   Warm the surfaces

   Insulate walls, roof and floors so surface temperatures rise and you feel warm at a lower air temperature.

3. 03

   Seal the air leakage

   Stop the draughts and escaping warm air that demand a higher setting and chill the rooms.

4. 04

   Treat thermal bridges

   Address cold junctions that create cold spots and lower felt comfort.

5. 05

   Check the emitters

   Ensure radiators can deliver the heat the rooms need once the loss is reduced.

6. 06

   Reset to a normal setting

   With the fabric improved, set a comfortable 19–21°C and confirm the home holds its warmth.

How to prevent it coming back

• Improve insulation so surfaces are warm and heat loss is low.
• Seal air leakage so warmth is not continuously lost.
• Address thermal bridges that create cold spots.
• Heat to a normal set point rather than overheating to offset cold surfaces.