How to replace your air conditioner

What about a window unit?

If you don't want to cut holes into your walls, window units can be an easy way to add air to a room. They have the cheapest up-front cost. You can buy window units at just about any big-box hardware store for less than $150.

But they're not perfect. They're heavy, and their weight can damage windowsills. They're also loud and not very efficient.

Still, window units can be ideal if you just want to cool down a bedroom at night, or you're in a smaller home that doesn't need much cooling.

You may also see portable units while you're searching for window units. They're the same thing, except that instead of hanging out a window, they sit on the floor, and you hook up a hose to the outside environment. They also usually cost more — from $300 to $700 each.