How to replace your air conditioner

What is the best unit for me?

The size of your home will help determine what kind of unit you'll need, but there are other factors to consider.

"The same house with windows on the south side versus the north side could make a huge difference, for example," says Rob Capri, an HVAC expert with Gault Energy, a Connecticut-based company.

Getting the right-size unit is important, too. But bigger isn't always better.

"If a unit is too small, it will not cool the house down enough to the desired temperature," Capri says. "It would continuously run in hot weather, making it more costly to operate."

If it's too large, the house will cool down fast, but the humidity will stay behind.

An HVAC contractor can help you determine if replacing your unit is necessary and what size unit would fit your home.