I performed a maintenance on two gas furnace one in the attic and one the basement also a heat pump in the basement also. I looked at all the low voltage took the blower motor amperage and cleaned the flame sensor off I checked the heat strips for normal operation and there good. I checked the charge and compaster on the out door system. The system are running and operating like they should be at this time 16x25x5 two of them and one 16x20x5 homeowner is going to pervade them.