Despite the fact that we use our air conditioner on a daily basis, most of us don’t know how to take care of them or even how they work. The air conditioning unit is, to many, a bit of a mystery. Often we don’t even know about problems existing in our units until it’s time for a full HVAC system replacement. AC maintenance is an important part of being a responsible homeowner — but there’s more to maintaining your HVAC system than just that. While you should have the number of a responsible AC repair company on hand, there are…