TUNE-UP FOR 8YR HEATING UNIT. CHECK THERMOSTAT, AIR FILTER, AIRFLOW. HUMIDIFIER, FAN CONTROL, ENERGY CONSUMPTION. HEAT EXCHANGER, HIGH LIMIT CONTROL, AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE. ADJUST BLOWER COMPONENTS, AND LUBRICATE ALL NECESARY MOVING PARTS.