With British summertime commencing and temperatures beginning to rise, a straightforward, no-cost technique endorsed by an NHS doctor is gaining attention for its potential to help keep homes cooler. The advice, which runs contrary to many people's usual habits, suggests that rather than opening windows and curtains to let in natural light, the opposite approach might be more effective in preventing heat build-up indoors.
The '5-second trick' centres on the principle of preventing warm air from entering and solar radiation from heating up internal spaces. Many households instinctively open windows and draw back curtains to welcome daylight when the sun is shining. However, this practice can inadvertently allow hotter external air to circulate indoors and direct sunlight to warm surfaces and rooms, making the internal environment less comfortable.
While specific details of the doctor's name or the exact NHS department were not provided, the general thrust of the advice aligns with common sense measures for heat management. Public health bodies, including the NHS, frequently issue guidance during periods of hot weather, emphasising the importance of staying hydrated, seeking shade, and keeping living spaces cool. For instance, NHS guidance often recommends keeping rooms cool by using light-coloured curtains or blinds and ensuring good ventilation at night when temperatures are lower.
The implications of such simple, cost-free methods are significant, especially given the increasing frequency and intensity of heatwaves in the UK. According to the UK Health Security Agency (UKHSA), heat-related illnesses and deaths can rise substantially during prolonged periods of high temperatures. In 2022, there were an estimated 2,985 excess deaths associated with heatwaves in England, underscoring the importance of effective cooling strategies for homes, particularly for vulnerable populations.
For many households, air conditioning is not a standard feature, making alternative cooling methods essential. The doctor's suggestion provides a practical and immediate step that individuals can take without incurring any expense. This approach could be particularly beneficial for those on lower incomes or in properties less equipped to handle sustained heat.
It is important to note that while keeping windows and curtains closed during the hottest parts of the day can help, it is also crucial to ensure adequate ventilation when temperatures drop, typically in the evening or early morning. This allows for cooler air to circulate through the home, helping to dissipate any accumulated heat. Consulting official NHS advice for comprehensive guidance on staying safe in hot weather is always recommended.
Source: NHS (general guidance on staying cool), UK Health Security Agency (heatwave statistics)