Indoor air conditioning is one of the best ways to beat the summer heat. For many, the convenience of central air remains out of reach, which leaves the AC window unit as the next best thing. Today’s window models are much better than what you might be used to, and nothing like the massive energy hogs they once were. Modern AC window units provide relief from searing temperatures, remove humidity, and use less electricity than ever before. However, if you don’t do your homework, it’s easy to end up with the wrong machine. You might get stuck with something too big, too small, or that simply doesn’t fit where you want. Read on to learn how to avoid these pitfalls.