Why Are Europeans Covering Their Windows with Aluminum Foil?
The escalating heatwaves across Europe have reignited discussions on how to keep homes cool without resorting to air conditioning. Particularly in the UK, France, and Germany, one method that has gained traction on social media is attaching aluminum foil to windows.
But why, you may ask? What role does aluminum foil play in combating the heat? Let's delve into it.
The goal is to reflect the sun before it permeates through the window.
Aluminum foil, with its shiny surface, has the ability to reflect sunlight. Therefore, when placed in front of windows during hot weather, it can help reduce the amount of light and heat entering the room.
However, according to experts, the key factor here is where the foil is positioned. If the foil is attached to the inside of the window, the sunlight first heats up the glass; the heat can then become trapped between the glass and the foil. This can lead to the glass, especially in double-glazed windows, heating up more and in some cases, it can increase the risk of cracking.
If this method is to be implemented, it is recommended to use the foil on the outside of the window as much as possible. The goal is to reflect the sunlight before it reaches the glass. Moreover, it is suggested to use more durable foil instead of thin kitchen foils, and not sticking the foil directly onto the glass is highlighted as a safer method.
Foil alone is not sufficient.
Installing aluminum foil on windows is perceived as a temporary and inexpensive solution during hot weather. However, it's not a permanent method for cooling. It requires careful use due to its unappealing aesthetic, potential conflict with building management rules, and the risk of damaging the windows if applied incorrectly.
Experts suggest that it would be safer to place the foil on a surface like cardboard and use it on the outside of the window, rather than sticking it directly onto the glass. This method not only helps protect the glass but also reduces the accumulation of heat directly on the window surface.
On the other hand, the Met Office recommends keeping windows and doors closed during the hottest hours of the day to keep homes cool. They also advise closing curtains or shutters in rooms that receive sunlight. Opening the windows in the evening when the outside air cools down can assist in ventilating the house.
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