Extra advice from the Centre for Sustainable Energy, WarmGuide and the British Red Cross hints at loft, window and textile tweaks that transform hot rooms. A three-step routine shows how to keep your house cool in a heatwave without air conditioning or fans, using shade, smart ventilation and a refuge. Recent UK heatwaves above 37C leave British homes sweltering, as guidance from the Met Office, UKHSA and NHS urges households to rethink hot-weather habits. Here is a three-step routine that works for typical UK flats and houses, even if you are renting. Their guidance is clear: "Keep windows covered and shut and close doors to stop warm air entering."