AC Repair San Antonio: Why Your System Stopped Cooling — and What It Will Cost

When your AC quits on a 100°F July afternoon in San Antonio, you don't have time to guess. You need answers fast — what's wrong, what it'll cost, and whether you can trust the company showing up at your door.

We're Yeti Cooling & Heating. We've diagnosed and repaired air conditioning systems across San Antonio, Boerne, Helotes, Schertz, New Braunfels, and every neighborhood in between. With 521 Google reviews averaging 4.9 stars, every repair we complete backed by a 1-year repair guarantee, and an industry-leading 12-year parts and labor warranty on new system installations, we've seen just about every AC problem this city can throw at a homeowner. This guide walks you through what we actually find, what it realistically costs, and exactly what to expect when you call us.

No pressure. No upselling. Just the straight story.

Why Is My AC Not Cooling? (The Most Common Causes)

If your air conditioner is running but blowing warm air — or barely keeping up — one of these issues is usually responsible. Here's what we find most often on service calls throughout San Antonio.

1. Dirty or clogged air filter -This is the most common cause we see, and the easiest to fix. When your air filter gets packed with dust and debris, airflow across the evaporator coil drops. The system works harder, cools less, and eventually overheats or freezes. Most manufacturers recommend changing filters every 30–90 days — in San Antonio, where systems run nearly year-round, that means closer to every 30 days during summer.

2. Low refrigerant (refrigerant leak)-Your AC doesn't "use up" refrigerant like gas in a car. If the level is low, there's a leak somewhere in the system. Low refrigerant means the system can't absorb heat efficiently, so you get warm air or weak cooling even when everything else looks fine. We'll find the leak, repair it, and recharge the system — just topping off refrigerant without fixing the leak is a waste of money.

3. Frozen evaporator coil-When airflow is restricted or refrigerant is low, the evaporator coil can ice over. A frozen coil is counterintuitive — the system looks like it's working hard, but it can't transfer heat. You might notice ice on the refrigerant lines near the indoor unit, weak airflow from the vents, or water dripping around the air handler. The coil needs to thaw before we can diagnose the root cause, which usually turns out to be one of the other issues on this list.

4. Failed capacitor-Capacitors are small electrical components that help your motors — the compressor and the fan motors — start and run. They fail more often in the Texas heat because extreme temperatures stress the components. When a capacitor fails, you might hear a clicking sound when the system tries to start, or the outdoor unit may run but the compressor stays off. Capacitor replacement is one of the more common AC repairs we handle, and usually one of the more straightforward ones.

5. Clogged condensate drain line-As your AC cools your home, it also pulls humidity out of the air — and that moisture has to go somewhere. It drains out through a condensate drain line. When that line gets clogged with algae, debris, or buildup, water backs up and has nowhere to go, which can cause water damage inside your home.

Most systems have a safety float switch installed specifically to prevent this: when water backs up to a certain level, the switch cuts power to the system to protect your home. Here's where it gets confusing — if the clog is a slow one, the switch may trip and shut the system off, then reset once the water drains down, only to trip again after the system runs for a while. If your thermostat seems to lose power and then come back on its own hours later, only to go out again after the system runs for a bit, a clogged drain line is very likely what you're dealing with. It's not an electrical problem or a bad thermostat — it's the safety switch doing its job. We can clear the line and treat it to prevent future buildup.

6. Duct leaks or disconnected ductwork-San Antonio homes — especially those built in the 1970s through 1990s — often have ductwork that has developed leaks, gaps, or disconnected sections over time. When conditioned air escapes into your attic instead of reaching your rooms, you get hot and cold spots, high energy bills, and a system that runs constantly without ever fully cooling the house. [Learn more about duct sealing and what it costs →] on our duct services page.

7. Aging or undersized system-A unit that's 15 or more years old is working against thermodynamic reality. Older systems lose efficiency steadily, and in San Antonio's climate, they get pushed hard every single summer. An undersized system — one installed without a proper load calculation — will run constantly and still leave you hot. These situations usually bring us to the repair-versus-replace conversation, which we'll cover below.

How Much Does AC Repair Cost in San Antonio?

This is the question nobody in our industry wants to answer directly. We do.

AC repair costs in San Antonio vary based on what's wrong, the age and brand of your system, and whether parts need to be ordered. Here's an honest breakdown of what you can expect.

AC Repair Cost Breakdown

Repair Type	Typical Cost Range	Notes
Diagnostic fee	$89	Applied toward repair if you proceed with us
Air filter replacement	$20–$60	Parts + labor; filter type affects cost
Capacitor replacement	$150–$350	Common repair; usually same-day
Drain line clearing and treatment	$150–$350	Prevents water damage and safety switch trips
Refrigerant recharge (after leak repair)	$200–$600+	Depends on refrigerant type and amount needed
Leak detection and repair	$150–$500	Location and accessibility affect cost
Blower motor replacement	$400–$900	Indoor unit; labor-intensive
Electrical/wiring repairs	$150–$500	Varies based on complexity

Our diagnostic fee is $89. When our tech arrives, that fee covers a full diagnostic — we check refrigerant levels, electrical components, airflow, motors, the drain line, and the overall condition of the system. If you move forward with the repair, that $89 is credited toward the work. We give you upfront pricing before any repair begins, so you're never surprised by the final invoice.

Our 1-Year Repair Guarantee

Every repair we complete is backed by a 1-year repair guarantee. If a component we serviced fails within 12 months, we'll come back and make it right at no additional charge.

Exclusions apply for issues outside our control: natural disasters, animal damage, heat exchanger failures, compressor failures, refrigerant leaks, and any items that were flagged as yellow or red during your diagnostic but not addressed at that time. If we note a concern during your visit and you choose to hold off on it, that item falls outside the guarantee — which is exactly why we walk you through the full picture of your system's health before you make any decision.

Should I Repair or Replace My AC?

The old rule of thumb says: if the repair costs more than 50% of a new system's price, replace it. That's not wrong, but it's incomplete — especially when you're comparing companies.

Here's what most homeowners don't factor in: labor warranty.

Most HVAC companies offer a 1–2 year labor warranty on installations. We offer a 12-year parts and labor warranty on every new system we install. That's 10+ years of additional labor coverage compared to what most competitors provide — meaning if something fails several years down the road, our customers aren't paying the technician's time out of pocket. That dramatically changes the long-term math on the repair-versus-replace decision.

We'll never push you toward replacement to make a bigger sale. If a repair makes sense, we'll tell you. If the honest answer is that you're throwing money at a system on its last legs, we'll tell you that too — and show you what a replacement would cost, with no pressure to decide on the spot.

[Get a free estimate for AC replacement →]

What to Expect When You Call Yeti for AC Repair

We know inviting a technician into your home requires trust. Here's exactly what happens from the moment you call.

Scheduling and confirmation. When you book with us — by phone or through [our website →] — you'll get a confirmation with your appointment window and your technician's name and photo before they arrive. No surprises.

Arrival. Our technician will introduce themselves, confirm who you are and what service you've scheduled, and ask permission before entering your home. We use shoe covers every time — your floors stay clean.

The diagnostic. We do a full system inspection: refrigerant levels, electrical components, airflow measurements, motor conditions, drain line, and the state of your ductwork. We're looking for the root cause, not just the symptom — and we flag everything we find, including items that aren't causing a problem today but could become one.

Upfront pricing, before we touch anything. Once we know what's wrong, we give you the price. Flat, upfront, no estimates that balloon once we're mid-job. You decide whether to proceed — there's no pressure either way.

Emergency AC repair. San Antonio summers don't wait for business hours. We offer emergency air conditioning repair for situations that genuinely can't wait — a home with young children or elderly residents in 105°F heat isn't a Monday-morning problem. Call us and we'll work to get someone out as quickly as possible.

How to Prevent AC Breakdowns in San Antonio

The best AC repair is the one you never need. In a climate like ours — where systems can run eight or nine months out of the year — preventive maintenance pays for itself.

Change your filter regularly. Every 30 days during summer, every 60–90 days in milder months. A clean filter is the single cheapest way to protect your system and your air quality.

Schedule annual tune-ups. Before cooling season (spring) and before heating season (fall) are the two most valuable times. A tune-up catches small problems — a capacitor starting to fail, refrigerant slightly low, a dirty coil, a drain line that's starting to slow — before they become expensive repairs in the middle of August.

Keep the outdoor unit clear. Trim back plants and shrubs to at least two feet around the condenser. Clean debris off the top of the unit after storms. Restricted airflow at the outdoor unit forces the system to work harder and shortens its life.

Watch for early warning signs. Unusual sounds (clicking, banging, grinding), weak airflow, higher-than-normal energy bills, rooms that aren't cooling evenly, or a thermostat that intermittently loses power — these are all signs that something is starting to go wrong. Catching it early almost always means a smaller repair.

The Yeti Comfort Club: Maintenance That Pays For Itself

Our Comfort Club maintenance plan → is $13.99/month and includes:

• 2 free tune-ups per year (spring and fall)

• 15% discount on all repairs

• Priority scheduling — you're not waiting behind non-members when a heat wave hits

• A detailed system report card after every visit so you always know the condition of your equipment

At $13.99/month, the two annual tune-ups alone — which would run $150–$250 individually — more than cover the cost of membership. The 15% repair discount on top of that makes it a straightforward decision for most San Antonio homeowners who plan to stay in their home for more than a year.

AC Repair Frequently Asked Questions

Q: How much does AC repair cost in San Antonio?A: AC repair in San Antonio typically ranges from $150 to $1,500+, depending on the problem. Minor repairs like a capacitor replacement or drain line clearing often fall in the $150–$350 range. Mid-range repairs — refrigerant leaks, blower motor replacement — typically run $300–$900. Larger repairs like evaporator coil work can exceed $1,000. Our diagnostic fee is $89, credited toward your repair if you proceed. We give you an exact price before we start any work.

Q: Why is my AC running but not cooling?A: The most common causes are a dirty air filter restricting airflow, low refrigerant from a leak, a frozen evaporator coil, a failed capacitor, a clogged condensate drain line tripping the safety switch, or duct leaks losing conditioned air before it reaches your rooms. A proper diagnostic will identify the root cause — often more than one of these issues are present at the same time.

Q: My thermostat keeps losing power and coming back on. What's wrong?A: This is almost always a clogged condensate drain line tripping the safety float switch. When the drain backs up, the switch cuts power to the system to prevent water damage. Once the water level drops, the switch resets and power comes back — until the system runs again and the water builds back up. It can repeat this cycle for days before a homeowner realizes it isn't an electrical problem. We can clear and treat the drain line on the same visit.

Q: Should I repair or replace my AC?A: It depends on the repair cost, the age of your system, and what warranty backs the work going forward. The general guideline is to replace if repair costs exceed 50% of a new system's price — but that rule doesn't account for labor warranty differences. Our new system installations come with a 12-year parts and labor warranty, compared to the 1–2 years of labor coverage most competitors offer. We'll give you an honest comparison of both options, no pressure.

Q: Do you offer emergency AC repair in San Antonio?A: Yes. We understand that a broken AC in San Antonio isn't always something that can wait until Monday morning. Call us and we'll work to get a technician to you as quickly as possible, especially for situations involving health or safety risks — elderly residents, infants, or anyone with a medical condition affected by heat.

Q: What does your repair guarantee cover?A: Every repair we complete is backed by a 1-year repair guarantee. If a component we serviced fails within 12 months, we'll make it right at no additional charge. Exclusions include issues outside our control — natural disasters, animal damage, heat exchanger failures, compressor failures, refrigerant leaks, and any items that were flagged but not addressed at the time of service. For new system installations, we offer our industry-leading 12-year parts and labor warranty.

Q: What areas do you serve?A: We serve San Antonio and the surrounding area within a 25-mile radius — including Boerne, Helotes, Cibolo, Schertz, New Braunfels, Universal City, and Castle Hills. If you're not sure whether you're in our service area, call us and we'll let you know right away.

Ready to Get Your AC Fixed? Here's What to Do Next.

When your air conditioner is struggling in San Antonio's heat, you deserve a straight answer — not a sales pitch, not a bait-and-switch, not a repair quote that doubles once the tech is already in your attic.

We're Yeti Cooling & Heating. Our diagnostic fee is $89, credited toward your repair. We show up with shoe covers, give you upfront pricing before we touch anything, and back our repair work with a 1-year repair guarantee. And if it's time to replace your system, our new installations are protected by the strongest warranty in San Antonio — 12-year parts and labor, no exceptions.

We serve homeowners across San Antonio, Boerne, Helotes, Cibolo, Schertz, New Braunfels, Universal City, Castle Hills, and the communities in between. Whether your system needs a quick fix or a full replacement conversation, we'll give you the honest picture — and let you decide.

[Schedule AC repair online at yeticomfort.com →] or call us directly. We'll have someone at your door, fast.