Keep the sun out
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On hot days, keep your curtains or blinds drawn, especially for windows that get direct sunlight. Windows that have no shade let sunlight into the room and heat it up.
Close your curtains and blinds to reduce the amount of heat the room will absorb. Open them in the evenings, when the temperature outside is cooler.
How effective? I closed the blinds in my bedroom when I went out. At the end of the day, it was not as hot as if I had left the windows open and the blinds up.
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