HVAC service and contracting is something too many people know nothing about. This can make it hard to choose a good HVAC system an issue for most homeowners. Know what type of system before looking for a repair person. This will let you to give your chosen contractor the information they might need. Know what you want done before you select an HVAC contractor. It will be hard for a contractor to give you a price estimate on the phone if they have not seen your current system. It will be more difficult for him to assist you can't figure out what they need to do. Turn the power off first so you don't get hurt or break something. Then, pop off its grills, pull the blades out, and gently clean them as well as the unit itself. Your outdoor HVAC unit may suffer when your trees lose leaves. Make sure the unit's fan grill is cleaned frequently when the fall. The fan must stay clear in order to function, and if debris is blocking this air flow, then your system cou...