Most technicians are guessing. We’re not.
A standard AC diagnosis is a technician listening, feeling for airflow, and making an educated guess. That works fine for obvious problems — but a slow refrigerant leak, a hairline crack, or a partially clogged coil can hide from a surface-level check for months while your system quietly wears itself out. Fresno’s extreme summer heat load makes this worse than it would be in a milder climate — components that would show mild wear elsewhere degrade faster here, and a guess-based diagnosis has less margin for error when the system is already running near its limits most of the season. Our X-Ray AC process is built to catch exactly what a guess-based diagnosis misses.
Micro-camera diagnostics
High-tech micro-cameras show the internal health of your system directly — not an inference from symptoms, an actual look inside.
Digital gauge calibration
Precision digital manifolds tune your system to exact manufacturer specs — not “close enough,” the actual number the manufacturer engineered for.
Visual proof, every time
We show you the data so you can see the health of your own system for yourself — not just take a technician’s word for what’s wrong.
One-and-done repairs, not repeat service calls
A repair based on a guess fixes the symptom you called about — and often nothing else. If the actual cause was a hairline crack or a partially clogged coil the tech never saw, you’re calling again in a few months for what looks like a “new” problem but is really the same one, undiagnosed. The X-Ray process finds the root cause the first time, which is the entire reason repeat callbacks aren’t part of how we do business. It also means we can tell you honestly when a repair genuinely isn’t worth it anymore — the diagnostic data shows compressor wear or refrigerant loss that a surface-level check simply can’t quantify, which is exactly the kind of finding that saves homeowners from sinking more money into a system that’s already on its way out.
What Fresno homeowners say about the diagnostic
4.8 stars across 1,200+ verified Google reviews — Fresno, Clovis, Madera, Sanger, Selma, and surrounding Fresno County cities.
Tony and his partner did such an incredible job and completed the work in a timely manner. They found an issue created by another company that could’ve set my home on fire.
Tony was very professional and friendly. He was thorough in his work. I appreciate that he took the time to answer my questions and listen to my concerns regarding my AC unit.
Three companies gave me quotes without even looking at the system. Grandmark ran a diagnostic and found the real issue. Saved me over $2,000 and my AC has been perfect ever since.
We’ll respond in 20 minutes or less
Tell us your symptoms and we’ll book your X-Ray diagnostic. During business hours, that’s typically within 20 minutes.
X-Ray diagnostic FAQ
What exactly does the X-Ray AC diagnostic check?
We use micro-camera diagnostics to inspect the internal condition of your system directly, and digital gauge calibration to verify refrigerant charge and pressures against exact manufacturer specs — catching cracks, clogs, and calibration issues a surface-level check would miss.
How much does the diagnostic cost?
$89, credited in full toward your repair if you move forward. You get the full diagnostic data either way — including the visual proof — whether or not you decide to repair.
Why does this reduce repeat service calls?
Most repeat calls happen because the original repair only addressed a symptom, not the actual cause. The X-Ray process is built to catch the real cause the first time — a hidden crack or clog that a listen-and-guess diagnosis would miss entirely.
Do I get to see the actual diagnostic data?
Yes — that’s the point. We show you the data so you can see the health of your own system for yourself, rather than just taking a technician’s verbal summary of what’s wrong.
More ways we help Fresno homeowners
Fresno HVAC Hub →
Every HVAC service we offer, all in one place.
AC Repair →
See how the diagnostic connects to our standard repair process and pricing.
No-Cool Emergency →
AC completely down right now? See priority dispatch details.
See what a real diagnostic actually finds
Micro-camera diagnostics. Digital gauge calibration. Visual proof, every time. $89, credited to your repair.
Grandmark Air Conditioning — Fresno, CA office
Licensed HVAC crews dispatched daily across Fresno County and surrounding cities.
(559) 245-1485 · CSLB #1030917