What Happens During an AC Tune-Up? A Phoenix Homeowner's Guide
By Sorensen Heating & Cooling · Updated March 2025 · 6 min read
If you've never had an AC tune-up done before, or you've had one where a technician showed up for 20 minutes, handed you a bill, and left, you might be wondering what you're actually paying for.
This is what it looks like when it's done right. Not everyone does it right.
Best time to schedule in Phoenix:
February through early April. Before summer heat hits, before every HVAC company in the Valley is booked out 3 weeks. Most problems found in spring tune-ups can be fixed before they strand you in 110°F weather.
The 6-Step Tune-Up, Minute by Minute
How Much Should a Tune-Up Cost?
In the Phoenix market (2025), a legitimate residential AC tune-up runs $89–$149 for a standard single-system home. Multi-system homes are priced per unit.
Be wary of $39 or $49 specials. We see the work these companies do, and it's not good. At that price point, the business model is finding "problems" that turn into $400 repair estimates. You pay $49 and walk away thinking you got a deal. You didn't.
At Sorensen, our residential maintenance plan is $149/year and includes two visits (spring and fall), priority scheduling, and 10% off any repairs needed. That's the best value if your unit is 5+ years old.
Red Flags During a Tune-Up
- ✗Technician arrives without gauges or test equipment
- ✗Tune-up takes under 30 minutes total
- ✗No written report or findings documented
- ✗"Your refrigerant is low" with no explanation of where it went
- ✗Immediate pressure to replace the unit on a first visit
- ✗No discussion of filter type, MERV rating, or replacement interval
- ✗Tech can't explain what they're doing when you ask
Signs of a Trustworthy Tech
- ✓Asks about your concerns before starting work
- ✓Tests capacitor and contactor (measures, doesn't guess)
- ✓Leaves drain line flushed and treated
- ✓Provides a written checklist of what was inspected
- ✓Refrigerant conversation is factual, not alarmist
- ✓Distinguishes what needs immediate attention vs. "watch it"
- ✓Doesn't rush. A real tune-up takes 60–90 minutes.
What to Have Ready When the Tech Arrives
- Access to outdoor unit (clear the area of stored items or furniture)
- Access to indoor air handler (usually in garage, attic, or closet)
- Thermostat access (or remote/app if you have a smart thermostat)
- Any past service records if you have them
- A list of any concerns: unusual sounds, rooms that aren't cooling, higher bills
Schedule Your Spring Tune-Up
Before the summer rush hits, get your system checked. Our maintenance plan covers two visits a year and includes priority service all summer.