What Does an HVAC Tune-Up Include (and How to Avoid Upsells)?

At minimum: burner and ignition system condition, heat exchanger inspection, gas pressure, flame sensor cleaning, blower amp draw and cleanliness, safety-control operation (limit switches, pressure switches), venting integrity, thermostat calibration, and a carbon monoxide reading. Our own checklist runs 26 points; whoever you hire, ask to see the completed list with actual readings — "everything looks good" isn't documentation.

Refrigerant charge verified by measurement (superheat/subcooling — not a guess), coil condition indoors and out, capacitor values, contactor condition, blower performance, condensate drain flow, and temperature split across the coil. Iowa's cottonwood season clogs outdoor coils fast, so a genuine coil cleaning matters here more than in most markets.

Three unglamorous, real reasons: small problems get caught cheap (a weak capacitor is a minor part; the compressor it kills is not), manufacturer warranties require it — including Amana's, whose terms expect documented regular maintenance — and efficiency drifts down as coils foul and burners drift out of spec, which you pay for monthly without noticing. Maintenance isn't magic; it's just cheaper than the alternative on average.

• A "failing" part condemned without showing you the measurement (capacitors, motors, and refrigerant levels all have measurable specs).
• Pressure to replace the system on the spot, on the first visit, from a tech paid on commission.
• A scary carbon-monoxide claim with no meter reading shown.
• "Your refrigerant needs topping off every year" — refrigerant doesn't get consumed; annual top-offs mean there's a leak that should be found and fixed.

You're entitled to the readings, the old parts, and a written quote before any repair. An honest contractor offers all three unprompted.