To do so, pop your AC filter out and hold it up to the light. If you can't see through the filter, then it's time for a new one. Below, find step-by-step instructions on how to change out your filter.

First, make sure your air conditioner is unplugged, then take off the front panel and remove the filter. If it's covered in ...

A reader wonders how often to change furnace filters to keep the air clean in her home. Learn the frequency with which homeowners should replace a furnace filter.