There's nothing like the crispy cool breeze of a well-functioning window air conditioner on a hot day. With a little maintenance, it's possible to keep your unit running cool all year long. But what happens when your air conditioner suddenly develops a thick layer of ice on its shell? Usually, this is a sign that the unit needs a bit of extra care. In this article, you'll learn how to de-ice your unit so you can attempt to get it back up and running again.