Changing regular air filters to a high efficiency pleated filter

Checking for air leaks in your ducting systems (you don't want to heat and cool your attic or outdoors)

Check refrigeration Freon presser level check for leaks

Check for temperature differential across coils

Oil lubricate motors bearings and all moving parts

Inspect clean and tighten all electrical connections controls relays contactors safety switches

Check on compressor and motors amp draw

Capacitor and starting components performance inspection

Inspect and collaborate thermostat

Inspect disconnect switches and fuses clean and tighten all connections

Clean and clear drain pen drain line condensation pumps

Clean coils for better air flow

Check for leaks clean and clear furnace flu vent (prevent carbon monoxide poisoning)

Check for cracks and leaks in firebox and heat exchanger (prevent carbon monoxide poisoning)

Check gas valve operation check for gas leaks