With energy prices where they are, heating is most households’ biggest bill — and winter is when the waste happens. When people ask how can I reduce my heating bills this winter, I don’t start with expensive upgrades. I start with the free stuff, because thermostat habits and draught-proofing can cut 15–20% off a bill before you spend a penny on insulation.

I’ve cut my own winter heating bill by nearly a third over three years, mostly through unglamorous tweaks. Here’s everything that works, in order of impact per pound spent.

How can I reduce my heating bills this winter? The free wins first

Turn your thermostat down by one degree — it saves roughly 10% on heating bills, and most people can’t feel the difference after a day. The 21°C default is a relic; 19–20°C with a jumper is the modern sensible target, and bedrooms only need 16–18°C for sleep. Next, stop heating empty rooms: turn radiators down (not off — off risks damp and frozen pipes) in unused spare rooms and close their doors. Heating rooms you don’t use is pure waste.

Use your heating controls properly — most people don’t. A programmer that heats the house for the hour before you wake and the evening, not all day, beats a thermostat left at 21°C around the clock. If you have thermostatic radiator valves (TRVs), set living areas to 3–4, bedrooms to 2–3, and hallways low — the boiler then works less hard overall. And bleed your radiators: cold spots at the top mean trapped air, and a radiator that’s half-cold is burning gas for half the heat. A radiator key costs £2 and the job takes an afternoon.

  • Thermostat down 1°C — saves ~10% instantly
  • Heat rooms you use; turn down (not off) the rest
  • Programme heating around your routine, not 24/7
  • Set TRVs by room: living 3–4, bedrooms 2–3
  • Bleed radiators with cold spots at the top
  • Lower your boiler flow temperature (see below)

The boiler setting most people miss

Here’s the single most underrated heating hack: lower your combi boiler’s flow temperature. Most combis leave the factory set to 75–80°C, but condensing boilers only condense (their efficient mode) when the return water is below about 55°C. Dropping the flow temperature to 60°C — or even 50°C in mild weather — can improve efficiency by 6–8% with no loss of comfort in a reasonably insulated house. It takes 30 seconds via the boiler’s front panel (the radiator symbol, not the tap symbol — don’t lower your hot water temperature).

If the house feels cooler, nudge it back up in 5°C steps until comfort returns — every house is different. While you’re at it, check your boiler pressure (1–1.5 bar when cold) and get the boiler serviced annually; a struggling boiler with a clogged filter burns measurably more gas. And if your hot water is scalding, lower the hot water temperature to 50–55°C — safer, cheaper, and your mixer taps still deliver comfortable showers.

Cheap fixes with fast payback

Draught-proofing is the best £100 you’ll spend on heating: brush seals for the letterbox and doors, silicone sealant around window frames, chimney balloons for unused fireplaces (£25 each, blocks the biggest heat leak in many houses). Heavy curtains — ideally thermal-lined, closed at dusk — cut window heat loss dramatically; even a £30 thermal curtain from Dunelm over a draughty patio door makes a noticeable difference. Reflective radiator foil behind radiators on external walls (£15 for a roll) bounces heat back into the room instead of warming the brickwork.

Then the habits: close curtains at dusk, keep internal doors closed, put on the slow cooker instead of the oven (an oven heats the kitchen but costs 10x to run), and wear the jumper — seriously, the difference between a t-shirt and a fleece is about 2°C of perceived warmth. A £25 heated throw for the sofa lets you drop the thermostat another degree in the evening. None of this is glamorous; all of it works. The households with the lowest bills aren’t the ones with the newest boilers — they’re the ones with the best habits.

Behaviour changes that actually stick

The technical fixes are easy; the behaviour is the hard part — and it’s where the lasting savings live. The changes with the best stick-rate: the ‘heating uniform’ (the household agrees on jumpers indoors — make it a thing, not a sacrifice), the evening thermostat ritual (set it when you get home, not left at a constant), and the ‘last out’ rule (curtains drawn, doors closed, heating checked when the last person leaves or goes to bed). These sound trivial; together they’re worth 5–10% of the bill.

Make the invisible visible: a smart meter display in the kitchen (£30–40, or free from most suppliers) showing live usage changes behaviour more than any lecture — households cut 5–15% just from seeing the numbers. The shower challenge (4-minute showers — a £10 timer in the bathroom makes it a game for kids), the ‘one warm room’ evening strategy in the depths of winter, and the annual autumn ritual: bleed radiators, check the boiler pressure, draught-proof check, book the service. Rituals beat resolutions — build the heating habits into the season’s rhythm and they stop being effort.

  • Household ‘heating uniform’ — jumpers as policy, not sacrifice
  • Smart meter display in the kitchen — visibility changes behaviour
  • 4-minute shower challenge (timer in the bathroom)
  • Annual autumn ritual: bleed, pressure-check, service, draught-check
  • Rituals beat resolutions — build habits into the season

Your winter heating action plan

This weekend: thermostat down a degree, bleed the radiators, lower the boiler flow temperature, draught-proof the worst gaps. This month: thermal curtains, chimney balloons, radiator foil. The combined saving is routinely 20–30% — hundreds of pounds over a winter — for under £200 total spend.

For the bigger upgrades, best energy saving upgrades for an old house ranks energy-saving improvements and choose the right boiler for a 4 bedroom house covers choosing an efficient new boiler. For personalised advice, the Energy Saving Trust’s advice is outstanding and MoneySavingExpert’s household money-saving tips has the latest bill-cutting tips.

The heating-bill philosophy: technology sets the ceiling, behaviour sets the floor. The best boiler in the world can’t compensate for 23°C and open windows; the humblest system sips fuel in a household with good habits. Do the cheap fixes, learn the controls, wear the jumper — and watch the bill fall by a third.