Window air conditioners provide an easy and convenient way to cool off any space, whether it's a small bedroom, a large living room, or an open concept area. Setup is usually straightforward, with options to fit single- and double-hung, slider, and casement windows, in both semi-permanent and temporary installations. To help you find the best window air conditioner for your space, we researched models from manufacturers like Midea, GE, Frigidaire, and more, to find top performing models suitable for small, medium, and large rooms, and different types and sizes of windows. We evaluated dozens of window air conditioners for cooling power, efficiency, features, window style compatibility, modes, and overall performance. We also looked for advanced features like enhanced air quality, quiet operation, and smart controls to find the best options for every room.What is a BTU?A window air conditioner’s cooling capacity is measured in BTUs. The BTU rating indicates how much energy is used to re...