I performed a heating maintenance on three units two are heat pump air handlers one in the attic and the other one in the basement I replaced the upstairs 16x25x5 filter and I checked all electrical components and checked the temp rise and checked the Freon levels and cleaned the drain lines the main level unit is a gas furnace Ac unit it is in the basement I did not have to replaced the 16x25x5 filter I checked all electrical components and checked the temp rise and checked the heat exchanger and cleaned and checked the flame sensor and checked the gas pressures the basement unit I replaced 12x20x1 filter I checked the temp rise and checked all electrical components and checked the Freon levels and I checked the condensers and checked the capacitors everything is in good working order at this time.