A well-programmed schedule is the most powerful single tool available to you. Setting setback temperatures during the night (16°C) and when the house is empty can save 15–30% on annual heating costs. Every degree you lower the thermostat saves approximately 7% on gas or oil. Use our free thermostat calculator to model exact savings for your schedule.

Most people feel comfortable at 19°C with light indoor clothing. If your thermostat is set to 21°C, dropping to 19°C saves roughly 14% on fuel consumption. Acclimatise gradually by reducing by 0.5°C each week — most people stop noticing after a few days. See our ideal room temperatures guide for room-specific recommendations.

Lowering the thermostat to 16°C overnight instead of leaving it at 20°C saves approximately 8–10% on overnight consumption. The house does not become uncomfortably cold during sleep — bedrooms are actually healthier at 18°C than 20°C.

An empty house heated to 20°C is pure waste. Set an away mode of 14–15°C whenever the house will be unoccupied for more than 3 hours. If you have a smart thermostat, geofencing automates this. See our smart thermostat guide for models with geofencing.

Air trapped in radiators creates cold spots and reduces heat output. If a radiator is warm at the bottom but cool at the top, it needs bleeding. The process takes 5 minutes per radiator with a bleed key (available for under £1). Bleed radiators at the start of each heating season for maximum efficiency.

Radiators mounted on external walls conduct heat into the cold wall rather than the room. Aluminium reflector panels (£5–£20 per radiator, adhesive-backed) redirect that heat back into the room. Studies show a 15–20% improvement in radiator output on external walls. They are especially effective in older, poorly insulated homes.

Draughts account for a significant proportion of heat loss in older homes. Self-adhesive foam draught strips for windows and letter-box brush seals cost £10–£30 per door or window and pay back within one heating season. Do not seal rooms that require ventilation (rooms with open fires or gas appliances) without professional advice.

Windows — even double-glazed ones — lose heat rapidly once the sun goes down. Closing heavy curtains at dusk creates a dead air layer that significantly reduces window heat loss. In a room with single glazing, this can reduce overnight heat loss from that surface by up to 40%.

Uninsulated hot water pipes in unheated spaces (loft, basement, garage, under-floor void) radiate heat into spaces where it is not needed. Pipe lagging is sold in pre-split foam tubes and costs under £1 per metre to install yourself. Payback is typically under two heating seasons.

Open interior doors allow warm air from heated rooms to flow into unheated corridors and hallways, which then requires more energy to reheat the main rooms. Keeping doors closed — especially to unheated rooms, hallways, and garages — reduces the volume of air the heating system needs to maintain at temperature.

A boiler that is not serviced loses efficiency gradually. Scale build-up, incorrect combustion settings, and worn components cause the boiler to consume more fuel for the same heat output. An annual service (typically £80–£120) maintains efficiency, prolongs the life of the boiler, and is mandatory in many European countries. For UK homeowners, it is often required to maintain the boiler warranty.

Modern condensing boilers are most efficient when the water returning from the radiators is below 55°C — this allows the boiler to recover latent heat from the flue gases (condensing mode). Many boilers are factory-set with a flow temperature of 70–80°C, which prevents condensing. Reducing the flow temperature to 55–60°C on a system with well-sized radiators can improve efficiency by 10–15% at no cost beyond the adjustment.

Radiators placed behind sofas or covered by radiator covers can lose up to 30% of their heat output. Hot air rises and then circulates the room — blocking the front or top of a convection radiator prevents this circulation. Move furniture away from radiators where possible, and avoid decorative covers unless they are specifically designed with adequate ventilation.

If you have rooms that are rarely used (spare bedroom, utility room, study), fit thermostatic radiator valves (TRVs) and set them to a lower level (1–2 on most scales, corresponding to approximately 12–15°C). This prevents overheating unused space while still protecting against frost.

A single heating schedule used all winter is inefficient. In mild autumn and spring weather, you need far less heat than in the depths of winter. Use our seasonal thermostat guide to adjust your schedule as the seasons change — reducing the number of heating hours in mild periods alone can save 5–10% on annual bills.