FIRST CLEAN AND CHECK UNDER SERVICE AGREEMENT FOR 7YR HEATING UNIT. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK HEAT EXCHANGER AND HIGH LIMIT CONTROL. CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, AIR FILTER, HUMIDIFIER, ENERGY CONSUMPTION, AIRFLOW, FAN CONTROL, AND ALL NECESSARY MOVING PARTS.