Which mini split air conditioners are best? Mini split air conditioners are heating and cooling systems that allow users to control temperatures on a room-by-room basis. They are more efficient than ...

Dear Jim: We added a room, but our central air conditioner doesn't cool it well. Our second floor master bedroom also does not stay cool. Does it make sense to install a window air conditioner or a ...

Mini-split heating and air-conditioning systems can boost your home’s energy efficiency, but they come with trade-offs, air quality experts say. These small, electric systems are replacing traditional ...