Our Top-Tested Air Conditioners Will Keep You Cool When the Temperature Soars

We've been independently researching and testing products for over 120 years. If you buy through our links, we may earn a commission. Learn more about our review process.Though most window AC units basically look the same, performance can vary widely from one model to the next. That's something I’ve learned through two decades of air conditioner testing, including the last three years as the director of the Home Improvement and Outdoor Lab at the Good Housekeeping Institute. Besides choosing a top-performing AC, I always tell people that it's critical to select the right size unit for the space you’re looking to cool. An oversized window AC can leave a room cool and clammy, plus you’ll spend more than you need to on it, since price tends to go up with cooling capacity. If the AC is too small, it won’t be able to cool the room to a comfortable level.Our team of engineers and product experts at the Institute test hundreds of different HVAC products, from portable air conditioners to humi...