Stop heating the outside. This Air Curtain is designed to be placed above a door, window, or any place you need air separation. Keep unwanted insect visitors from entering when you open your door. In the winter, keep the cold air pushed out of your house when you open your door. Then, move it inside in the summer to keep the cold air in your house. Plus, it plugs into a standard outlet, so you can place it anywhere. Keep your cool where you need it and the bugs outside, where they belong.