Attaching an uninsulated garage to your house is like bolting a 400-square-foot furnace to it. It will be 100-plus degrees inside during the summer and will wear your home’s air conditioning system out with the hot air that transfers from the garage to the house.
Air conditioning an uninsulated garage—or even using a swamp cooler in it—is like air conditioning the Great Outdoors: The cool air will leak right through the door, ceiling and walls.
If you’re reorganizing your garage or buying a new garage door, consider adding insulation. Insulated walls, ceilings and doors can block the heat so it doesn’t penetrate to the inside of the garage, and they can keep the cool, conditioned air indoors where it belongs.
In fact, replacing an older garage door with a new, energy-efficient model can reduce energy loss through the garage door by up to 71 percent, according to manufacturer Clopay.
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