Keep Your Windows Closed or Open During a Heatwave?
The article explains the most effective strategy for keeping a house cool during a heatwave: windows should be kept closed during the hottest part of the day and opened at night or early morning to let in cooler air. It also advises using blinds, curtains, and shades to block direct sunlight from heating up the interior.
Background
- The "windows open or closed during a heatwave" debate is a recurring topic in English-speaking media whenever a heatwave hits the UK or US, because many homes lack air conditioning.
- The article advises: when outside air is hotter than inside air, keep windows closed and use shades/curtains to block sun; when outside air is cooler (typically at night), open windows to let in cooler air.
- In the US, roughly 90% of homes have AC, but in the UK, fewer than 5% do, so British readers rely on passive cooling strategies like strategic window use.
- Key related terms: "stack effect" (hot air rises, so opening top-floor windows lets heat escape) and "cross-ventilation" (opening windows on opposite sides to create a breeze).