An AC filter is a layer of protection between you and the particles in your air. As your cooling system sucks up air, it filters out dust, dander, and allergens. But your filter only lasts so long, and particles will begin to build up. This causes your AC to work harder to cool your home and drives up your energy bills. It also puts unnecessary wear on your system.
If you want to keep your system running, you should change out or clean your filters on a regular basis. Typically, this is something that you should do every three months and at the start of a new season. It may be simple, but it’s highly effective at keeping your AC healthy.