What a tune-up actually covers
Almost every homeowner is offered a maintenance plan, and almost none are told what is in one. The gap matters, because a real tune-up is a measurement visit that finds problems while they are small — and a cosmetic one is a sales call with a filter change attached.
What a real cooling visit measures
The parts you can watch: filter checked and changed, the outdoor coil inspected and cleaned, the condensate drain flushed and the pan and float switch tested, electrical connections tightened, the blower wheel looked at. On attic equipment, the secondary pan and its drain checked too — this is the visit where a ceiling gets saved.
The parts that separate a service visit from a wipe-down are the numbers: the temperature split across the coil, static pressure on both sides of the blower, refrigerant pressures compared against the day’s conditions, and the compressor and fan motor amp draws against their ratings. Those four readings are the system’s vital signs. A capacitor measurably weak in April is a small planned part; the same capacitor in July is an emergency in a queue.
The heating visit, and reading the paperwork
On the heating side the emphasis shifts to combustion and safety: burners cleaned, flame sensor serviced, ignition sequence verified, venting checked, and the heat exchanger inspected. On heat pumps, the defrost cycle and the changeover to backup heat — the setting that quietly decides winter bills. Ask for the findings in writing either way.
That written report is how you judge the plan. A serious one leaves numbers behind: readings, comparisons to last visit, and a short list of what is trending. A weak one leaves a checklist with everything ticked and a quote for something large. Two more questions worth asking before signing: does the plan cover both systems in a two-story house, and what exactly does the priority scheduling promise mean in the first week of a heat wave — because that week is when it is worth anything.
Quick answers
- How often should a system be serviced here?
- Twice a year suits this climate: cooling in spring before the heat, heating in fall before the first cold snap. Both visits land in shoulder seasons when the calendar is open and findings can be scheduled instead of rushed.
- How do I tell a real tune-up from a sales visit?
- Ask for the numbers. Temperature split, static pressure, refrigerant pressures and amp draws, in writing. A visit that produces a checklist and a replacement quote — but no readings — did not measure anything.
Next step: What a replacement quote should itemize
Plans differ widely in what they include and what they discount. Read the scope, not the headline price — and ask what happens in the busiest week.