Does changing my furnace or air conditioning filter each month save energy?
Changing your furnace or air conditioning filter regularly (at least every 3 months) is a good idea, but it is hard to know how much energy it actually saves. Check your filter every month, especially during heavy use months (winter and summer). If the filter looks dirty after a month, change it. At a minimum, change the filter every 3 months. A dirty filter will slow down air flow and make the system work a little harder to keep you warm or cool – wasting energy.
