5 Quick Ways to Ruin Your Air Conditioner (Are You Guilty?)
Mistake #4 -- Ignoring Your Filters

A dirty air filter is like running a marathon with a pillow over your face. Your system has to work harder, cools less effectively, and risks internal damage.
What to do: Replace your filters every 1--2 months. If you have pets or allergies, do it more often. It's cheap, easy, and makes a huge difference.