San Antonio · AC Surge Protector Installation Repair · Family-Owned Since 1996
San Antonio summer storms cook control boards, blow capacitors, and fry motors every year. A unit-mounted surge protector stops the damage at the disconnect — cheap insurance for a $7,000 system.
Typical price
$385–$485
Time to fix
45–60 minutes
Urgency
High in March–May before storm season
Your AC system has more electronics than your refrigerator. Modern units have communicating control boards, ECM motor modules, and smart thermostats — all of which die instantly from a voltage spike. CPS Energy grid surges and August lightning are the leading cause of out-of-warranty AC failures in San Antonio.
A dedicated HVAC surge protector mounts at your outdoor disconnect (and optionally at the indoor air handler), absorbs voltage spikes before they reach the sensitive components, and trips a visible indicator if it ever takes a hit so you know to replace it. They last 5–10 years and self-replace one component (the MOV) when blown.
$385 to install one surge protector at the outdoor disconnect. $485 for both outdoor and indoor protection. Compare to $700 for a control board, $1,500 for an ECM motor, or $3,000 for a compressor — payback after one summer storm.
What it costs in San Antonio
$385–$485 — $385 for outdoor disconnect only. $485 for outdoor + indoor air handler protection. Our $59 diagnostic is waived when you approve the repair, so you only pay for the fix itself.
If two or more of these sound familiar, it's probably your ac surge protector installation.
Here's exactly what a Carnes and Sons tech does at your house — no mystery, no upselling.
Verify space, conduit, and grounding at the disconnect box. A proper install needs solid ground bond.
Surge protectors install in parallel across the line — they don't carry load. We wire them inside the disconnect with proper torque, weather sealing, and labeling.
For full system protection we install a second unit at the air handler — catches surges coming through the low-voltage thermostat circuit too.
Energize, confirm the green 'protected' LED is lit, and label the install date so you know when to inspect it.
Get Your AC Surge Protector Installation Diagnosed Today
Tell us what's happening. We'll text you back in minutes — no call center, no robo-calls.
If you've had any electronic component failure after a storm, yes. If your system is high-efficiency, communicating, or has variable-speed components, yes. If you've never had a problem and your system is basic, it's still good insurance — but lower priority.
$385 for outdoor disconnect protection. $485 for outdoor plus indoor air handler. Compare to $700 for a control board, $1,500 for an ECM motor — first storm pays it back.
It helps a lot, but doesn't catch everything. Whole-home surge protectors at the meter block big spikes, but smaller induced surges from nearby lightning or your own contactor cycling can still get through. Two-stage protection (whole-home + AC-dedicated) is the gold standard.
5–10 years typically. The MOV components inside absorb energy each time they trip — after enough hits they wear out. Quality units have a visible LED indicator that goes dark when the MOV is spent.
Almost never. Manufacturer warranties exclude 'acts of God' and electrical surges. A $385 surge protector is cheap insurance against $1,500–$3,000 of out-of-pocket repair.
We carry ICM Controls and Intermatic-style units rated 50kA+ per line. UL-listed, MOV-based, with visible status indicators. Both are field-proven in San Antonio's climate.
Possible, but you're working inside a live disconnect with 240V. Risks include arc-flash injuries, wrong wiring (in series instead of parallel), and missing the ground bond. Not a DIY job for most homeowners.
No — surge protectors are passive devices wired in parallel. They don't carry load and have zero effect on system operation. The only thing you'll notice is a small green LED inside the disconnect.
We're based in Stone Oak and roll trucks across San Antonio and the surrounding Hill Country every day.
License TACLB29435E · Family-Owned Since 1996
Cities & neighborhoods we serve
San Antonio · Stone Oak · Alamo Heights · Hollywood Park · Hill Country Village · Shavano Park · Castle Hills · Leon Valley · Helotes · Boerne · Fair Oaks Ranch · Bulverde · Timberwood Park · Garden Ridge · Schertz · Cibolo · Selma · Universal City · Live Oak · Converse · Windcrest · New Braunfels
No call center. The owner or one of his sons picks up.
(210) 600-5091