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To help keep your home cool in summer make sure that your attic is well ventilated. Sun beating down on the roof all day can raise attic temperatures to over 130 degrees F/54 degrees C. As a result, upstairs rooms will be much hotter even if you have adequate ceiling insulation. Air conditioners will have to work harder and your electricity costs will be higher. Consider adding attic fans to help exhaust this unwanted hot air. When connected to a thermostat, it can be set to turn on when the attic temperature reaches around 100 degrees F/40 degrees C. It is important to select the right size fan for your home. It should be sized large enough to properly exhaust the hot air and bring cool air in. Consult your local heating-cooling contractors if you are unsure of the correct size that you need and make sure that it is installed high in the attic.