* Check and adjust burner assembly
* Check ignition assembly
* Check heat exchange
* Monitor flue draft
* Monitor refrigerant pressure
* Test starting capabilities
* Test safely controls
* Replace standard air filters if provided by customer
* Check and adjust blower components
* Measure for correct air flow
* Tighten electrical connections
* Measure volts / amps
* Check evaporator coil if accessible
* Clean condenser coil
* Clean condensate drains
* Measure temperature difference
* Clean outside unit
* Complementary filter replacement (if provided by customer)