Start With the Gaps You Can Feel

Most of the heat you pay for doesn't vanish in one dramatic whoosh. It seeps out slowly, through letterboxes, keyholes, chimney breasts, loft hatches and the gap under the back door. Before you start pricing up new windows or a boiler replacement, it's worth spending a weekend on the small stuff. A few rolls of draught excluder, a couple of radiator panels and a box of LED bulbs will often come in under £60, and you'll notice the difference on the next bill.

The trick is to work through the house methodically rather than buying gadgets at random. Start where you can feel cold air on the back of your hand, and fix the cheapest problems first.

Draught-Proofing: Cheap, Fast and Genuinely Effective

Draught-proofing is the best value job in the house. Materials cost pennies and most of it is a screwdriver-and-scissors task.

• Doors: fit brush or wiper strips to the bottom of external doors and self-adhesive foam or rubber seals around the frame. For older Victorian front doors, a keyhole cover and a brush strip inside the letterbox take ten minutes and stop a surprising amount of cold air.
• Windows: if the frames are sound but rattly, run a strip of silicone or rubber draught seal around the opening sash rather than reaching for replacement windows.
• Chimneys: an unused open fireplace is a chimney-shaped hole in your heating. A chimney balloon or draught excluder stops warm air vanishing up the flue. Never block a chimney that's still in use.
• Skirting and floors: a bead of sealant along the gap where skirting meets floorboards, and along the edge of floorboards, kills cold draughts in older homes.

One important caveat: don't seal a room that contains a gas boiler, open fire or wood burner. These need a permanent air supply, so leave vents and airbricks clear. Bathrooms and kitchens also need some ventilation to prevent damp and mould, so draught-proof the living spaces first and let wet rooms breathe.

Make Your Radiators Work Harder

If your radiators sit against external walls, a chunk of their heat is warming the brickwork outside rather than your living room. Reflective radiator panels — essentially foil-faced insulation that slots behind the radiator — bounce that heat back into the room. They cost a few pounds each and are only worth fitting on external walls; there's no point behind a radiator on an internal wall.

A few other quick wins:

• Bleed your radiators at the start of the heating season. Cold spots at the top mean trapped air, and the boiler works harder for less warmth.
• Fit thermostatic radiator valves (TRVs) so bedrooms and spare rooms aren't heated to the same temperature as the lounge.
• Move furniture and shorten curtains so they don't block the radiator. Tucking curtains behind a radiator, or investing in a radiator shelf, pushes warm air out into the room instead of up the window.
• Turn the boiler flow temperature down if you have a condensing combi. Many sit higher than they need to, which wastes gas.

Lighting: The Easiest Swap in the House

Lighting is a small slice of most bills, but it's the simplest thing to fix. Old halogen spotlights — the ones in kitchens, hallways and bathrooms — typically draw 35–50W each, and a room with six of them is burning through power every evening. Modern LED replacements use roughly 4–6W for the same brightness and last for years.

Swap them room by room rather than all at once, and choose warm white (2700K) for living rooms and bedrooms so the house doesn't feel like an office. Don't forget lamps, outdoor security lights and the bulb inside the oven hood.

Hot Water and Appliances: Quiet Savings

Water heating is often overlooked. If you have a hot water cylinder, check it has a decent insulating jacket — 80mm is the recommended thickness — and lag any exposed hot pipes in the airing cupboard and loft. Pipe insulation is a few pounds per metre and takes minutes to fit.

In the kitchen and utility room:

• Wash clothes at 30°C on a shorter cycle. Modern detergents work perfectly well at low temperatures.
• Only run the washing machine and dishwasher when they're full, and use the eco setting even though it takes longer — it uses less energy overall.
• Air-dry washing on a rack or line when you can. If you use a tumble dryer, spin clothes first to cut drying time.
• Boil only the water you need in the kettle, and use a lid on pans.

Habits That Cost Nothing at All

The cheapest measures are the ones you already own. Turning the thermostat down by a single degree can trim roughly a tenth off your heating bill, and most people genuinely don't notice the difference — 18–20°C is comfortable for a living room. Set the timer so the heating comes on half an hour before you wake and goes off half an hour before bed, rather than running all evening.

Close curtains at dusk to trap warmth, open them on sunny south-facing windows during the day, and shut internal doors to keep heat where you're actually sitting. Keep showers short, fix dripping hot taps, and defrost the freezer if ice is building up.

None of these jobs will transform your home overnight, but together they add up to a house that holds its heat, a boiler that works less hard and a bill that's noticeably gentler. Start with the draughts, work through the radiators, and you'll feel the benefit long before the next price rise lands.