When the sun beats down on your windows for hours at a stretch, even a well-ventilated home can start to feel like an oven by mid-afternoon.Even though air conditioning helps, it also results in long electricity bills quickly, and not everyone has it running in every room.That’s why so many people are turning to old-school, low-cost tricks and solutions when the heat gets unbearable, and one of the most viral tricks right now is covering the windows of your home with kitchen aluminum foil.While the aluiminium foils are mostly found in our kitchens, meant to wrap food to keep it fresh and help in roasting ingredients, it has now become a way to keep the house cool and temperatures low.Sounds bizarre, right?But it all comes down to the silver metal’s shiny nature. Aluminum foil has a reflective surface, and that is what makes it useful against the sunlight. Instead of letting sunlight pass through the glass and warm up the room, the foil bounces a good portion of that radiation back outside before it ever gets the chance.Even though it’s not a permanent fix, it won’t replace proper insulation or window treatments suitable for the job. But it is a quick way to get some respite for a while.
How does Aluminium foil help to keep the rooms cooler
By blocking a portion of incoming solar radiation, foil-covered windows reduce the heat that builds up inside a room over the course of a hot day. This can be effective in those spaces that get direct, prolonged sun exposure, like west-facing bedrooms or living rooms in the late afternoon. It doesn’t drop the temperature massively on its own, but along with fans, cross-ventilation, or air conditioning, it can noticeably lighten the load and help a room feel less like a greenhouse by evening.
How to cover the windows with aluminium foil
Foil works best when the sunlight gets reflected before it ever reaches the glass.For this, take a piece of foil that is equal to the size of the glass window, and tear it from the roll.Then place it over the window and stick it with cello tape. Placing the aluminium foil on the outside of the window generally outperforms sticking it on the inside. When foil is applied indoors, the window pane itself still absorbs heat and can even warm up enough to stress or crack the glass over time. Covering the exterior side reflects the radiation away right at the source, keeping both the room and the glass itself noticeably cooler throughout the day.
What precautions should be kept in mind when using this hack?
Aluminum foil is a stopgap, not a solution. It doesn’t offer the durability, appearance, or year-round performance of professional solar control films, insulated glazing, or exterior shading systems that are specifically made for thermal protection.It can also block most or all natural light, which isn’t practical for each room or every day. This hack can be used as an emergency measure for the worst stretch of a heatwave, not something meant to stay taped up on your windows all summer long.
