It’s okay for the average homeowner to know little more than the bare minimum about their air conditioning and heating systems. You may not know how a compressor works or the science behind refrigeration, but that’s okay! (And kudos if you do know.)
Still, there is one part of your air conditioning system (and heater) you should know about. Your home’s air filter is something that seems to have little effect on your comfort unless you’re worried about allergies or asthma, but there’s more to it than this consideration.