With the thermometer reading forty degrees, we see neighbors closing blinds and windows as if expecting a hurricane. Logic says to insulate against the heat, but the result is an interior that feels like a bakery oven. Why do we repeat this ritual that turns our homes into steamless saunas? The answer lies in household physics and a widespread myth.
The Domestic Greenhouse Effect: How to Trap Heat Unintentionally 🌡️
Double-glazed windows and sealed frames work like a thermos. When sunlight hits the glass, short-wave radiation enters, heats objects inside, and turns into long-wave radiation that cannot escape. By closing everything, we prevent the cross-ventilation that would dissipate that accumulated heat. The technical solution involves strategically opening windows at night and using exterior awnings that block radiation before it enters, not after.
The Day I Locked Myself in My Own Greenhouse 🥵
A friend installed windows with thermal break and triple glazing, thinking he would be the king of coolness. On the first hot day, he sealed everything tightly, sat on the sofa, and waited for the miracle. At two in the afternoon, the thermostat read 38 degrees, and he was in his underwear hugging a bag of frozen peas. The windows weren't the problem; the lack of nighttime ventilation and a flimsy awning were the real culprits.