It's critical to get the right size when buying a window air conditioner. Consumer Reports explains how to do it. Plus, the best small, midsized, and large window AC units.

Frigidaire 6,000 BTU Window Air Conditioner with Remote Control 20% OFF. This Frigidaire air conditioner is a great pick for smaller rooms. With 6,000 BTUs, it can cool up to 250 square feet, ...

For the purposes of this post, we're focusing specifically on BTU ratings for window air conditioners. Read more: 5 Signs You Need to Replace Your Window Air Conditioner. BTU basics.

LG – 14,000 BTU Smart Window Air Conditioner $75 OFF For larger rooms, the LG 14,000 BTU air conditioner can cool up to 700 square feet, plus it offers a range of features, including Wi-Fi ...