What to schedule
Schedule cooling-system tune-up helps keep the hvac system observable and reduces the chance that a small maintenance issue goes unnoticed.
The baseline interval is spring. Usage, pets, dust, water quality, weather and manufacturer instructions can require a different interval.
Stop before the task becomes repair work
Use qualified service for live electrical testing, gas work, refrigerant work, roof access, hidden leaks, structural damage or required disassembly.