HVAC systems are obviously complicated, with expensive and delicate electrical components, large appliances, tricky gas systems, and other things that homeowners don't want to mess with. That being said, HVAC maintenance isn't something that should only be left to professional technicians and contractors. The fact of the matter is, your HVAC system needs more constant maintenance then you are probably giving it. Even if you have your system serviced once or twice a year, there are a lot of simple things homeowners can do to maintain their system.
5 January 2018