Spring AC tune-up checklist — what your HVAC pro should do (and what you can DIY)

What a real tune-up includes (the 12-point checklist)

1. **Refrigerant pressure check** with gauges on both lines. A low charge is the #1 cause of weak cooling. 2. **Capacitor microfarad test** with a meter. A weak capacitor will fail in July, not April. 3. **Contactor inspection** — pitted contacts mean a $20 part now or a $300 emergency call later. 4. **Condenser coil cleaning** — fins straightened, debris flushed with low-pressure water. 5. **Evaporator coil check** — opens the air handler, checks for ice buildup or biofilm. 6. **Blower amp draw** measured against nameplate. High draw = motor failing. 7. **Drain-line clear** — pours vinegar or shop-vac the trap; a clogged drain trips the float switch in August. 8. **Thermostat calibration** with a probe thermometer at the supply register. 9. **Electrical connections torqued** to spec — loose connections cause arc damage. 10. **Air filter swap** — if you didn't already do it. 11. **Condensate pump test** (if applicable). 12. **Cooling cycle measurement** — temperature differential should be 16–22°F between return and supply.

Pre-visit DIY (saves 15 minutes of their time, full price stays the same — but pre-pays goodwill)

**Replace the air filter** the night before the visit. Use the date-stamped pleated 1-inch (don't use cheap fiberglass, don't use thicker than 1-inch unless your unit is rated for it). **Clear 2 feet around the outdoor unit.** Sticks, leaves, dryer-lint clumps, the kids' frisbee. Hose off the fins gently. **Listen to the unit run for 5 minutes.** Note any new sounds: rattling (loose panel), grinding (failing fan motor), hissing (refrigerant leak). Tell the tech.

Red flags during the visit

**'Your refrigerant is low — we need to add 5 lbs.'** No competent tech tops off without first finding the leak. R-410A doesn't 'use up' — it leaks. A top-off without a leak hunt buys you 6 months and another bill. **'Your capacitor is bad and the part is $400.'** A run capacitor is $20 wholesale, $80 retail with labor. $400 is a tell. **'You need a whole-system replacement.'** Maybe — but only if your unit is 12+ years old AND multiple components are failing. Get a second opinion before signing anything during a tune-up visit. **The tune-up itself is over in 20 minutes.** A real one takes an hour minimum.

When to book your Toledo tune-up

Best window: **mid-March to mid-April**. Schedules are open, prices are at their lowest ($79–$99 specials), and you have time to handle any repair findings before May heat. Worst window: late June. Everyone is panic-booking and prices are list ($129–$179) with 2-week wait times.

What you can skip if your unit is under 5 years old

Capacitor + contactor checks: skip every other year if components are factory-fresh. Drain-line clear and coil cleaning: still annual.

Frequently asked