When it’s hot outside, sometimes you need a little help cooling your home down. As such, it might be time to start looking for a new window-mounted air conditioner to keep your home nice and cool, so that you don’t roast over the summer months. Of course, there are a ton of window air conditioners to choose from, and they’re not all worth buying. Some are simply lower quality and won’t last as long as others that are better-built and more energy-efficient. There are a number of things to consider when you’re buying a window air conditioner, and you’ll want to think about them before you buy to ensure that you get the best quality. For starters, you’ll want to consider the air conditioner’s BTU – or “British Thermal Unit” — rating. The higher the number here, the better the unit will be able to remove heat from the room. But a higher BTU also means it will likely consume a little more energy. Check out the list below to figure out the BTU rating you’ll need depending on how large your room is. Figures are courtesy of Lowes. You’ll also want to think about the air conditioner’s energy efficiency rating, ...