Like any appliance, air conditioners need a little TLC to deliver optimal performance. ACs that haven’t been kept in top-notch condition tend to struggle most. We asked air conditioner pros and ...

If defrost isn’t working, something in the chain is broken. This step-by-step approach shows you exactly where to look and what to test.

Replacing or buying a new central air conditioning system can be a huge expense, so you’ll want to get it right. To peg down systems that are likely to last, we measure and track the reliability of ...