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Use Weather Strips On Doors

Weather strips are adhesives that are pretty easy to install and help keep cool or warm air from escaping out the cracks between your door and the doorframe. Not every door in your house might need weather strips, though, and you can check by using a flashlight. If you can shine the light and see it through the cracks from the other side, then there's some cool or warm air getting through there.

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Weather strips can be bought at most hardware stores, and since they usually use adhesive to stick to doorframes, they're really easy to install. They're also especially useful if you're trying to heat or cool an area of your home with a window unit.