CLEAN AND CHECK A/C & HT. CHECK THERMOSTAT, CHECK BURNERS & BURNER OPERATION, CHECK HUMIDIFIER, CHECK HEAT EXCHANGER, CHECK GAS PRESSURE AND FOR PROPER VENTING, CHECK CONDENSER COIL, CHECK AIR FILTER, CHECK FREON LEVELS, CHECK DRAINAGE, CHECK ALL ELECTRICAL CONNECTIONS. ADJUST BLOWER COMPONENTS, LUBRICATE ALL NECESSARY MOVING PARTS. EVERYTHING IS RUNNING GREAT. RENEWED SERVICE AGREEMENT.