When selecting a vent fan, consider how much noise they make ... and eventually cause odors or leak into the ceiling below.

A common use for inline exhaust fans is to vent two bathrooms. A plastic exhaust grille in each bathroom (usually in the ceiling) attaches to ducts, which then fasten to a "Y" connector at the fan.

However, there is one easy and simple tip experts recommend you do every year to keep your home cool without hurting your wallet — make sure your ceiling fans are spinning in the right direction.