How to properly care for a gas furnace:
Clean or replace the filter quarterly
Ensure the blower motor is functioning correctly
Set the thermostat to 68 or lower
Ensure the exhaust flue to the outside is clear of debris
Remove all flammable objects from around the furnace
How to properly care for an HVAC unit
Clear a two-foot space around outdoor AC unit
Buy a high efficiency pleated air filter
Keep the AC unit free of dirt, grass, leaves and other debris
Replace the air filter every month during the summer and every six weeks when you are using heat