★ Check filters
★ Ensure drain line is clear
★ Check thermostat
★ Check evaporator coil for cleanliness
★ Tighten all electrical connections
★ Check condenser coil (clean if necessary)
★ Check voltage & amperage to capacitor / motors
★ Check superheat & subcooling
★ Check blower & blower wheel for cleanliness
★ Check contact points on contactor
★ Check refrigerant charge / possible leaks
★ Check temperature differential (supply & return air)
★ Check defrost cycle & reversing valve
★ Ensure electrical breakers are sound
★ Inspect crossover duct & supply boots
