Overview
- The UK is in its third heatwave this summer with forecasts this week for widespread temperatures in the mid-30s Celsius and amber and yellow heat-health alerts in force in many regions.
- Low-cost tricks such as bowls of cold water or ice on windowsills and placing ice in front of fans have been widely shared and endorsed by some energy advisers as ways to make rooms feel cooler without air conditioning.
- Health and safety bodies caution these hacks have limits and hazards: electric fans can be counterproductive once indoor temperatures reach about 35°C, very cold water can slow body cooling by constricting skin blood vessels, and attaching wet items to fans risks electric shock or mechanical failure.
- Emergency services already reported higher demand during June’s heatwave, and experts warn prolonged hot nights will worsen sleep loss, raise dehydration and kidney or cardiac risks, and increase wildfire and infrastructure pressure.
- Official guidance urges simple, low-risk actions such as staying indoors during the hottest hours (roughly 11:00–15:00), closing blinds by day and opening windows when outside air is cooler, keeping hydrated, and checking on older or vulnerable neighbours.