You can take real heat out of a room with no air conditioner by working three levers at once: stop heat getting in (shade the windows, close up by day),…

For a window that overheats, external shading is the single most effective thing you can fit — more effective than any curtain, blind or film, because it stops the sun…

A few pounds of draught excluder and weather-seal tape is the cheapest cooling upgrade there is — because the gaps that lose heat in winter let warm air in during…

Yes — solar-control window film genuinely reduces heat gain, and because it acts at the glass it tends to beat an internal curtain or blind for cutting solar heat. But…

For a bedroom, thermal blackout curtains do two useful jobs at once: they’re the most effective internal shading you can buy — a dense weave and thermal lining slow the…

Put a fan in an open window facing outwards so it blows the warm indoor air out, and open a window on the opposite side of the home to let…

Draught-proofing isn’t just a winter job — the same gaps that let warm air out in January let hot air in during a heatwave, and they undo the cool you’ve…