A window air conditioner can offer welcome relief on a hot day. Window units are an excellent choice for many homes because they're versatile and fairly easy to install.

Before purchasing a window air conditioner, measure your window to ensure that you get the right size unit. Another factor to consider is your window's closing orientation. Many window air conditioners have side expansion panels to accommodate vertical windows, but you may have to build your own barriers if your window opens horizontally.

It's also important to figure out how much cooling power you'll need. Determine the square footage of the room you want to cool, then figure out how many BTUs you'll need to cool your space.

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