Work With the Sun, Not Against It

British homes are built to hold heat, not to shed it. Our walls are thick, our windows are often small and our insulation is designed for a February frost, which is wonderful for nine months of the year and faintly absurd in a July heatwave. The single most effective thing you can do is stop the sun before it reaches the glass, because once solar gain is inside, no amount of fanning will shift it.

Get into the habit of closing curtains and blinds on east-facing windows at sunrise and on south and west-facing windows by mid-morning. Reopen them in the evening once the sun has moved off the glass, and let the cooler air in. If you have a choice, pale, tightly woven curtains with a separate lining perform far better than dark, loose weaves — dark fabric absorbs heat and radiates it back into the room, while a dense pale weave reflects more of it away.

Curtains hung close to the wall and slightly wider than the window frame are much more effective than ones that stop short, because they trap a layer of still, warm air between the fabric and the glass rather than letting it spill into the room. Outside the window, a simple awning, a bamboo roller blind or even a strategically placed parasol will beat any interior blind, because it intercepts the heat before it becomes a problem.

Open the Windows at the Right Hours

Cross ventilation is the oldest cooling technology we have, and it works beautifully if you use the right windows at the right time. The goal is a through-draught: an opening on one side of the house and another on the opposite side, ideally at different heights, so warm air escapes high and cool air is drawn in low.

• Night purging: open windows wide after about 9pm and leave them open until roughly 8am, or earlier if the air outside is already warmer than the air inside.
• Daytime: close windows and curtains together around mid-morning. An open window with the sun blazing through it simply funnels hot air inside.
• Internal doors: keep bedroom and living room doors open on the shaded side of the house so the cooler air can travel. A closed door is a dam.
• Safety: for upstairs windows left open overnight, use a restrictor or a lockable vent position, and never leave a ground-floor window open when you are out.

Choose Natural Fibres for Beds and Seating

What you sleep on matters as much as what you sleep under. Synthetic sheets, polyester duvets and foam-filled mattress toppers trap heat and moisture against the skin; natural fibres move both away from you. Linen is the gold standard — it absorbs up to a fifth of its weight in moisture before feeling damp, dries quickly and stays cool to the touch. Cotton is the accessible alternative; look for loose-weave percale rather than a sateen finish, which is woven more densely and sleeps warmer.

For bedding, switch to a light cotton or linen duvet cover with just a flat sheet inside, or dispense with the duvet entirely and use two sheets. Wool is a surprisingly good summer choice for pillows and mattress toppers — it breathes, regulates humidity and does not go clammy the way synthetics do. Hemp and bamboo are worth exploring too, both for sheets and for lightweight throws. When you are choosing upholstery or cushions, the same logic applies: a linen or cotton slipcover over a sofa will feel markedly cooler than a polyester blend. If you keep a spare set of summer covers, storing them in a linen bag rather than a plastic one keeps them fresh and dry.

Strip Back, But Keep the Floors in Mind

Light colours reflect heat and light colours read as cool, which is why a quick swap from a dark wool throw to a pale cotton one lifts a room even when the thermometer has not moved. In a heatwave, thin out the layers: remove heavy rugs, floor cushions, extra throws and anything else that holds warmth and blocks air movement across the floor.

That said, do not strip a room completely bare. A single wool rug on a tiled or stone floor can be a relief in the early evening, when the floor feels cool underfoot, and bare floors in direct sun simply radiate heat back up. The slow-living approach here is not minimalism for its own sake — it is putting back only what genuinely helps, and letting the rest rest.

Cooling Rituals That Cost Nothing

Some of the oldest tricks still work better than any gadget. A cotton sheet hung in a doorway and misted lightly with cold water will cool the air passing through it, particularly if there is a through-draught. A hot water bottle filled with cold water and left in the freezer makes an excellent bed cooler for twenty minutes or so. A shallow basin of cool water for the feet before bed lowers the whole body's temperature more effectively than any fan directed at the face.

Move your life downwards as the day heats up: an upstairs bedroom at 4pm is often three or four degrees warmer than a hallway or kitchen below. Eat outside or in the coolest room, keep the oven off, and let the evening meal be something cold — a salad, a plate of tomatoes and bread, whatever needs no flame.

Keep the Heat You Make Down

Every appliance is a small radiator. Delay the washing machine, dishwasher, tumble dryer, iron and oven until after dark, or run them early in the morning, and dry laundry outside or on an airer in the coolest part of the house. Incandescent bulbs throw off far more heat than LEDs, so if any remain, this is the fortnight to change them.

Showers are another quiet offender; a hot shower raises the humidity of the whole floor, so keep the door open afterwards and run the extractor fan. Taken together — curtains drawn early, windows opened wide at night, natural fibres against the skin and appliances held back — these habits will keep a British home comfortable through the worst of a heatwave, without ever reaching for the air conditioning switch.