A tune-up is a measured inspection, not a filter change with a checklist. On cooling equipment, the service professional cleans the condenser coil, checks refrigerant charge against superheat or subcooling targets, tests capacitor microfarads against rating, inspects the contactor for pitting, clears the condensate drain, measures the temperature split, and verifies amp draw on the compressor and fan motors.
On heating equipment, the visit covers the ignition sequence, burner and flame sensor condition, gas pressure, heat exchanger inspection, carbon monoxide screening, limit and safety controls, and blower performance.
Temecula's dry summers push dust and pollen through condenser coils faster than humid climates do, so coil condition drives more efficiency loss here than most homeowners expect. Findings are documented with priorities, and any recommended repair is quoted upfront before work begins.