Castle Hills, TX · AC Repair Near You
AC repair & replacement
in Castle Hills.
Your Castle Hills home gets premium AC repair and heating service from a real local family — not a national chain bouncing techs through. Same-day repairs, $59 diagnostics waived with the fix, and Carrier-certified installs that respect your home's mid-century character.
$59
Diagnostic — waived with repair
$6,700+
Carrier system installed — written quote, no upsell
$0 down
Financing approved in minutes
Castle Hills is one of those tucked-away neighborhoods I've worked in for decades. A lot of these homes were built in the '50s, '60s, and '70s, with additions and renovations layered in over the years — which means the HVAC systems are usually a patchwork. I know how to look at a Castle Hills system and tell you what was done right, what was done cheap, and what we can clean up. No upsell, no scare tactics — just an honest plan.
Clint Carnes
Owner · 28 years in San Antonio HVAC · TACLA licensed
From Castle Hills neighbors
What people across Castle Hills say.
"Financing through Carnes was painless — $0 down, manageable monthly payment, brand-new Carrier system. Less than what we'd been spending on emergency AC repairs every summer."
Trevor R.
Alamo Heights
"Cedar fever and oak pollen were destroying us in Castle Hills. Carnes upgraded our air filtration to a 4-inch MERV 11, sealed return-side leaks pulling attic dust in, and the difference was immediate."
Tara F.
Hollywood Park
"Annual AC tune-up caught a weak capacitor and a dirty condenser coil before they failed in July. Cheap insurance — exactly what HVAC maintenance is supposed to be. The other company we used to use just topped off refrigerant and called it a day."
Patricia H.
Hollywood Park
"Crew that did our Carrier install put booties on, laid drop cloths, and vacuumed the hallway when they were done. Hauled the old AC unit and copper off without us asking. Little things matter."
Sarah P.
Alamo Heights
"I'm a single mom in Shavano Park and I was bracing to get taken advantage of on AC repair. Clint just told me what was wrong, what it'd cost, and what I could put off until next year. No drama, no scare tactics."
Mike & Lisa T.
Shavano Park
"Condensate drain line was clogged and water was dripping through our ceiling in Alamo Heights. Carnes cleared the AC drain line, flushed it, and installed a float switch so it can't flood the house again. Honest work."
Carlos & Maria S.
Alamo Heights
"Our 18-year-old AC unit finally died. Clint walked us through HVAC replacement options without the high-pressure pitch. The Carrier system they installed runs quieter than the old one ever did and the CPS bill is noticeably lower."
Jordan & Casey N.
Hollywood Park
"Builder-grade AC system in our Alamo Heights home was undersized from day one. Carnes did a proper load calculation and sized a Carrier 17 SEER for the actual square footage. House finally cools on triple-digit days."
Doug L.
Alamo Heights
"Vacation home in Castle Hills sits empty most weekends. Their HVAC maintenance plan caught a slow refrigerant leak before we drove in to a hot house and a flooded ceiling."
Gina B.
Alamo Heights
"Hot bedrooms in our two-story Castle Hills home for years. Carnes did a proper duct assessment, found undersized returns and leaks at the plenum, and fixed it. We'd been told for years it 'just is what it is.' It wasn't."
The Foster Family
Hollywood Park
"Our older AC unit ran on R-22 and was low on refrigerant. Carnes was honest — said they could top it off but at our system's age the smarter move was a new R-410A Carrier. No pressure either way. We chose the AC replacement and the Carrier financing made it doable."
Olivia P.
Alamo Heights
"Thermostat was the actual problem, not the system. Other AC company in Castle Hills would've sold us a new control board. Carnes swapped the stat and we were done in 20 minutes."
The Reyes Family
Shavano Park
"AC was running but not cooling. the install crew found a dirty condenser coil packed with cottonwood and a slightly low refrigerant charge. Washed the coil, topped off, done. Whole house was cold within an hour."
Michelle G.
Shavano Park
"Contactor was pitted and the AC wouldn't kick on. Quick repair from Carnes — they showed me the burned contacts so I'd know what they were charging me for. No upsell to a full HVAC replacement like the last company tried."
Derek J.
Alamo Heights
"Got a second opinion after another big-name Castle Hills HVAC company told us we 'needed' a $14K replacement. Carnes found a stuck reversing valve and a low charge. Repaired both. System still running fine three years later."
Drew & Kim L.
Alamo Heights
"AC wouldn't turn on at all on a 102° Sunday. Carnes diagnosed a tripped float switch from a slowly clogging condensate line — cleared the line, reset the switch, no charge for the float. Other companies would've turned that into a service call plus a 'recommended' replacement."
Linda C.
Shavano Park
"Two-story home in Alamo Heights, upstairs would never get below 80°. Other AC company quoted us a second system. Carnes added a return, sealed leaky ducts, and balanced the airflow. Fixed for a fraction of what the second-system quote would have been."
Nicole R.
Alamo Heights
"Power flickered during a storm and the AC wouldn't turn on. Carnes replaced the surge-blown contactor and capacitor and installed a hard-wired surge protector on the disconnect. Smart preventive work."
George W.
Shavano Park
"Clean AC install. Tight line set, properly pitched condensate drain, labeled disconnects, breaker sized correctly, permit pulled, inspection passed first try. The kind of HVAC work you don't see anymore."
Amanda & David W.
Hollywood Park
"Outdoor unit was humming but the fan wasn't spinning. Turned out to be the run capacitor. Another HVAC company in Castle Hills had told my dad it was the compressor and quoted him a full system replacement. Carnes fixed it in twenty minutes."
Megan H.
Shavano Park
"Allergies were brutal this spring. Clint installed a 5-inch MERV 13 media filter cabinet and cleaned the evaporator coil. Wife stopped waking up congested within a week. Real air filtration, not the 1" cardboard filter the builder put in."
Pete K.
Shavano Park
"AC stopped cooling on a Saturday in July. Called Carnes for AC repair, the install crew was at our Hollywood Park house in under two hours. Capacitor was bad — replaced it on the spot. Two other companies in Castle Hills had told us we needed a whole new AC unit. We didn't."
The Salinas Family
Hollywood Park
"Air conditioner drain line backed up and the system kept shutting off. Another Castle Hills HVAC company wanted to come out, charge a diagnostic, and reschedule the actual repair for the next week. Clint's tech cleared the clogged condensate drain line same day."
The Whitfield Family
Hollywood Park
"Other contractor refused to repair our AC and only quoted full replacement. Carnes came out, replaced the failed run capacitor and a worn contactor, and the system has been fine ever since. They actually fix things instead of selling new units."
Ray & Debbie A.
Hollywood Park
"What sold me was that Clint answered his own phone. No call center, no runaround. Just a guy who knows AC and gives you a straight answer about repair versus replacement."
Wes C.
Shavano Park
"Carrier Factory Authorized Dealer matters because we got an extended warranty on top of Carrier's standard one. Other installers in Castle Hills couldn't offer that, even on the same equipment."
Kristin & Paul E.
Shavano Park
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AC acting up in Castle Hills?
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(210) 600-5091