You might see an EER (Energy Efficiency Ratio) number for your portable air conditioner, which measures the cooling ...

The best air conditioners efficiently and quietly cool your space. These are the best window and portable units for bedrooms, ...

You also don't want to buy a model that's too powerful for a room. Sure, a 12,000-BTU air conditioner will cool a small space (150 square feet or less) quickly.

These results were consistent across similar tests for seven pairs of air conditioners from different brands. We tried the 8,000- and 12,000-Btu versions of the same ACs from GE, Frigidaire, and ...

For a living room or family room of 350 to 550 square feet, you’ll want a large air conditioner with 9,800 to 12,500 Btu, especially if you have an open floor plan. Here are three solid choices ...