Tucson & Oro Valley’s honest HVAC

Cool, honest comfort for Tucson homes & businesses

From a quick AC fix to a whole new system, Calibrated gives you straight answers, fair quotes, and work we stand behind. No upsells. No scare tactics. Just reliable air.

5.0 on Google Licensed, Bonded & Insured · ROC #360125 Serving Tucson & Oro Valley
AC Shirley, the face of Calibrated Mechanical Systems
Right nowCool & comfortable
The promiseNo upsell, ever
5.0 Google rating
Licensed, Bonded & Insured
No-upsell promise
Residential & Commercial
Tucson & Southern Arizona
The honest difference

When it’s 105° out, you need someone you can trust

An AC that quits in the Tucson heat is miserable. Worrying that you’ll be talked into a repair you don’t need makes it worse. That’s exactly the part we fixed.

  • Facts first, alwaysWe diagnose the real issue and show you, so you’re never guessing.
  • Fair quotes, in writingYour options and the price up front, with no pressure to decide on the spot.
  • Repair before replaceIf a fix will do, we say so. We won’t sell you a system you don’t need.

They always show up when they say they will, and they don’t try to up-sell. Time after time their quotes come in under anyone else’s. You can trust them to give you good value and get the job done.

T Verified customerGoogle review
What we do

Complete heating & cooling, done honestly

Whatever your home or business needs to stay comfortable, AC Shirley and the team handle it, the right way.

AC Repair

When your AC quits or just can’t keep up, we find the real problem fast and fix it right.

Most requested

AC Installation & Replacement

Right-sized systems and straight repair-or-replace advice, never a pushed upsell.

Maintenance & Tune-Ups

Seasonal tune-ups that catch small issues before they become breakdowns in the heat.

Heating & Furnace

Repairs and installs that keep you warm on those cold Tucson desert nights.

Emergency AC Repair

Down in the heat? We prioritize emergency calls and get you cool again fast.

Fast response

Ductless Mini-Splits

Perfect for additions, casitas, and rooms that never cool right. Quiet, efficient comfort.

Heat Pumps

Energy-efficient heating and cooling in one system, sized for Arizona.

Swamp Cooler Service

Evaporative cooler repair and tune-ups, done right for desert homes.

Commercial HVAC

Dependable service for offices, restaurants, and property managers across Tucson.

Free second opinion

Been told you need a whole new system?

Before you spend thousands, let AC Shirley take an honest look. Sometimes a system really does need replacing, and sometimes it absolutely doesn’t. Either way, you get the truth, in writing, with zero pressure.

Get my second opinion No cost. No pressure. Just facts.
What you might be told“You need a whole new system.”
then call us
What AC Shirley says“Let’s see if we can fix it first.”

Another company told me I needed to replace my motor, and he was very thorough with his explanation as to why I don’t need to. He’s honest and fair with his pricing. He will be my HVAC guy moving forward.

Sus V. · recommended Calibrated on Facebook · March 31, 2026
AC Shirley of Calibrated Mechanical Systems
Meet AC Shirley

A real person behind every call

Ryan “AC Shirley” Shirley built Calibrated on a simple idea: treat people the way you’d want your own family treated. You’re not getting a faceless call center, you’re getting a neighbor who knows Tucson, knows these systems, and tells it to you straight.

TransparentWe tell the truth, even when it’s not the easiest answer.
DependableWe do what we say we’re going to do.
ApproachableProfessional doesn’t have to mean stuffy. We make HVAC easy.
AccountableIf something isn’t right, we’ll make it right.
SteadyNo pressure. No scare tactics. Just good information.

We don’t serve rich people. We serve responsible people.

How it works

Comfortable again in four simple steps

No runaround, no surprises. Here’s exactly what happens when you call.

1

Call AC Shirley

Tell us what’s going on. A real person answers, not a call center.

2

Honest Diagnosis

We show you the actual problem and explain it in plain English.

3

Upfront Quote

A fair price and your options, in writing, with zero pressure.

4

Fixed Right

We do the work, clean up, and make sure you’re comfortable again.

What backs the work

Credentials you can count on

Honesty is the promise. This is the proof behind it, so you can feel confident before we ever show up.

Licensed, Bonded & InsuredArizona ROC #360125. Fully covered on every single job.
All Major BrandsWe service and install every major AC and heating brand.
We Fix, Not Just ReplaceIf it can be honestly repaired, we tell you, and save you thousands.
We Stand Behind Our WorkIf something isn’t right, we make it right. That’s the promise.

Fully Licensed in Arizona

ROC #360125

Licensed, bonded, and insured. That means the work meets state standards and you’re protected, on every job, every time. Ask any contractor for their number. We lead with ours.

Stay ahead of the heat

A maintenance plan that pays you back

The cheapest repair is the one you never need. Our maintenance plan keeps your system tuned, efficient, and ready before Tucson’s worst days arrive.

  • Seasonal tune-ups before cooling and heating season
  • Priority scheduling when you need us most
  • Early catches that prevent costly breakdowns
  • Longer system life and lower energy bills
  • Ask about plans
What neighbors say

Trusted across Tucson

5.0

Rated 5.0 on Google · Reviews on Google, Facebook & Yelp

“They always show up when they say they will, and they don’t try to up-sell. Time after time their quotes come in under anyone else’s. You can trust them to give you good value and get the job done.”

TVerified customerOracle, AZGoogle

Honest, on time, and they explained everything in plain English. No pressure to buy anything I didn’t need. Refreshing.

HHomeownerOro Valley, AZGoogle

Got a second opinion from AC Shirley after another company quoted me a whole new unit. He fixed it for a fraction. Customer for life.

RHomeownerTucson, AZGoogle

Additional reviews shown are representative of common customer feedback and are imported from Google, Facebook, and Yelp at launch.

Where we work

Proudly serving the greater Tucson metro

Based in Oro Valley, we cover the communities across Southern Arizona that count on honest, dependable comfort.

  • Oro Valley · home base
  • Tucson
  • Marana
  • Catalina Foothills
  • Vail
  • Sahuarita
  • Green Valley
  • Oracle
  • SaddleBrooke
  • Catalina
  • Casas Adobes
  • Tanque Verde
Good questions

Straight answers, before you call

Will you try to upsell me or push a new system I don’t need?
No. That’s the whole point of how we work. We tell you the truth about what your system needs, give you honest options, and let you decide. No pressure, no scare tactics.
Do you really give free second opinions?
Yes. If another company told you that you need a costly repair or a whole new system, call us first. We’ll take an honest look and tell you straight, often it saves people thousands.
How fast can you come out in an emergency?
We know an AC out in the Tucson heat can’t wait. Emergency calls get prioritized, so call us and we’ll get to you as fast as we can.
What areas do you serve?
We’re based in Oro Valley and serve the greater Tucson metro and Southern Arizona, including Marana, Catalina Foothills, Vail, Sahuarita, Green Valley, Oracle, and SaddleBrooke.
Are you licensed, bonded, and insured?
Yes. We’re fully licensed, bonded, and insured in Arizona under ROC #360125, so you’re protected on every job.
Do you service all AC and heating brands?
Yes, we repair, maintain, and install all major air conditioning and heating brands, whatever system you already have.
Do you handle commercial HVAC too?
We do. Alongside homes, we keep offices, restaurants, and properties across Tucson comfortable with dependable commercial service.
Do you offer maintenance plans?
Yes. Our maintenance plans cover seasonal tune-ups and priority service to keep your system running through the desert heat and save you from surprise breakdowns.
Ready when you are

Let’s get you comfortable again

Call AC Shirley for honest HVAC you can count on, no upsells, no scare tactics, just reliable air for your Tucson home or business.

Open Mon-Sat, 8am-5pm · Emergency service available Oro Valley · Serving Tucson & Southern Arizona Licensed, Bonded & Insured · ROC #360125
Call AC Shirley Request Service