(Some so-called ductless air conditioners are actually heat pumps.) They tend to cost a little more than AC-only units but less than the combined cost of a new heating and cooling system.

Less-efficient units and those used to cool larger rooms will cost more. The important answer to this question is to follow the directions for your air conditioner. Call a professional if you ...

While they typically cost more than window AC units, the best portable air conditioners are a great solution in wildfire emergencies (especially in areas that don't regularly see sustained ...

Looking to beat the heat without breaking the bank? Here are the top portable air conditioners, tested by CNET's experts. Laboratory Technical Project Manager Gianmarco Chumbe has been part of the ...