Blowing Warm Air?
Don't Panic. We Fix
the Part and Save You Thousands.
Tired of big corporate companies telling you that you need a whole new $10,000 system? At Cornerstone, we don't do high-pressure sales pitches. We provide honest diagnostics, fast component repairs, and old-school service to get your home cool again today.
Live in Waxhaw? You're a Neighbor —
and Neighbors Get 15% Off.
Waxhaw is home base for us, so we take care of our own. Every Waxhaw resident automatically gets 15% off any repair, tune-up, or air quality service — no coupon to clip, no fine print. Just mention you're a Waxhaw neighbor when you book and we'll apply your hometown discount.
Discount available to Waxhaw, NC residents. Let us know you're a neighbor at the time of booking.
Got an Outrageous Quote?
Get a Cornerstone
Second Opinion.
Before you throw away an entire air conditioning system, let us take a look. Often, a system just needs a simple component swap—like a new capacitor, control board, or fan motor—to run beautifully again. We fix the actual problem, not sell you a box.
Call for a Free Second OpinionOur Core Services
Cooling Repairs & Swaps
Fast, precision diagnostics and replacement of failed components including capacitors, contactors, fan motors, and control boards to restore your existing system to factory condition.
- Capacitor & contactor replacement
- Fan motor diagnostics & swap
- Control board troubleshooting
- Refrigerant leak detection
Whole-Home Air Scrubbers
Professional integration of premium Air Scrubbers and UV purification systems directly into your existing ductwork to eliminate dust, pet dander, viruses, and indoor odors.
- UV germicidal light systems
- ActivePure air scrubbers
- HEPA filter upgrades
- Odor & allergen elimination
Maintenance & Tune-Ups
Comprehensive multi-point cleaning, electrical checks, and component testing to keep your system running at peak efficiency all summer long and prevent unexpected breakdowns.
- Multi-point safety inspection
- Coil cleaning & flush
- Electrical connection check
- Efficiency performance test
$49.00 A/C & Heating Tune-Up
A full multi-point safety and efficiency tune-up by a Cornerstone technician — coil cleaning, electrical checks, and a performance test that catches small problems before they turn into breakdowns. No membership required.
See Our Technicians at Work
Why Neighbors Choose Cornerstone
Honest Flat-Rate Pricing
You approve the price before we touch a single component. No surprise invoices.
We Repair, Not Replace
Our whole business model depends on fixing things — not upselling you a new system.
Local & Accountable
We live here too. Our reputation is built one neighbor at a time.
Fully Vetted Technicians
Background-checked, trained pros who treat your home with respect.
Every Installed Part Is Covered for a Full Year
We stand behind our work. Every part we install comes with a 1-year warranty by default — no extra paperwork, no upsell, no fine print. If a component we put in fails within the year, we make it right.
Rated 5 Stars by Charlotte Homeowners
"Another company quoted me $9,000 for a new system. Cornerstone replaced one part, backed it with a full-year warranty, and my AC has been ice cold ever since. Honest people."
"Came out same day when our upstairs was 85 degrees. Found a bad capacitor, fixed it fast, and walked me through everything. No pressure, no nonsense."
"I asked for a second opinion and I am so glad I did. The tech checked the refrigerant, found a small leak, and saved us thousands. Five stars without a doubt."
"Professional, on time, and respectful of our home. He even reset our thermostat and showed my wife how to use the schedule feature. Highly recommend."
"Our furnace quit on the coldest night of the year. They had a tech out quickly, diagnosed it honestly, and the part came with a warranty. Lifesavers."
"Finally an HVAC company that does not try to sell you the moon. Flat-rate pricing, quality parts, and they stand behind the work. We will not call anyone else."
Proudly Serving the Greater Charlotte Area
Cornerstone Air Service is local, and we keep it local. We provide honest AC and heating service across the Charlotte metro and into the Rock Hill, SC area. Not sure if you're in our zone? Give us a call — if we serve your neighbor, we serve you.
Outside these counties? We still want to hear from you. Call or text 919-714-9518 and we'll let you know right away if we can get a technician to your home.
Mecklenburg County
- Charlotte
- Matthews
- Mint Hill
- Huntersville
- Cornelius
- Davidson
- Pineville
- Ballantyne
Cabarrus County
- Concord
- Kannapolis
- Harrisburg
- Mount Pleasant
Union County
- Monroe
- Waxhaw
- Indian Trail
- Weddington
- Stallings
- Marvin
Iredell County
- Mooresville
- Statesville
- Troutman
York County, SC
- Rock Hill
- Fort Mill
- Tega Cay
- Clover
Gaston & Rowan
- Gastonia
- Belmont
- Salisbury
- China Grove
Schedule Your Service Online
Answer a few quick questions about your system and what it's doing. It takes about a minute — and it means your technician shows up already knowing the problem, with the right parts on the truck. Prefer to talk? Call or text us — we pick up.
What can we help with?
We focus on getting your existing system running right — repairs and maintenance only.