Summary:
If your AC is 10 years old and starting to act up, you’re probably wondering the same thing a lot of Bexar County homeowners wonder: is this worth fixing, or am I throwing money at a system that’s already on its way out?
It’s a fair question — and the honest answer depends on more than just the age of the unit. In our region, the climate does things to an HVAC system that most manufacturers don’t fully account for. Before you call anyone or approve any work, it helps to understand what’s actually happening inside your system and why Bexar County is harder on equipment than most places in the country.
How Long Does an AC Unit Actually Last in Bexar County?
The national average you’ll see quoted is 15 to 20 years. That number is real — but it assumes a climate where the AC runs maybe four months out of the year. Bexar County is not that climate.
Here, the cooling season runs from roughly April through October. Seven months. And during July and August, when temperatures regularly push past 100°F, your system isn’t cycling on and off the way it does in a milder place — it’s running almost continuously just to keep up. Our region averages around 2,900 cooling degree days annually, which puts it among the highest concentrations in the entire continental U.S.
What that means practically is that a system installed here ages faster than its nameplate suggests. A realistic lifespan in Bexar County is closer to 10 to 12 years with regular maintenance — and less without it.
What Our Heat and Humidity Actually Do to Your AC Over Time
It’s not just the heat. Bexar County sits in what’s classified as a Hot-Humid Climate Zone — the same designation that applies to coastal cities, not the dry heat of West Texas or Phoenix. That matters because your AC isn’t just cooling the air in your home. It’s simultaneously pulling moisture out of it. That dual workload puts more strain on the compressor, the coils, and the refrigerant system than cooling alone would.
Add to that the conditions inside the average Bexar County attic, where temperatures can climb to 140°F or higher in summer, and you start to understand why air handlers and ductwork in this region age faster than the equipment specs suggest. If your air handler sits in the attic — which it does in most homes here — it’s operating in an environment that is genuinely punishing, even when everything is working correctly.
There’s also the maintenance factor, and it’s a big one. Dirty coils reduce heat transfer efficiency by 20 to 30 percent, which forces the compressor to work harder than it was designed to. Skip a few annual tune-ups, and a system rated at 15 SEER2 can start performing like a 10 SEER unit within five years — silently, without any obvious warning signs, just a steadily rising electric bill. The Department of Energy has confirmed that regular maintenance keeps a system running at roughly 95 percent of its original efficiency. In a market where you’re running the AC seven months a year, that’s not a minor detail.
The other thing worth knowing — and this catches a lot of homeowners off guard — is the refrigerant transition happening right now. Most systems installed before 2025 use R-410A refrigerant. New systems manufactured in 2026 use R-454B, and the two aren’t interchangeable. If your outdoor unit fails and needs to be replaced, you can’t simply swap in a new condenser and recharge it. The refrigerant mismatch means the entire system — indoor unit and outdoor unit — has to be replaced together. It’s not a contractor upsell. It’s federal law, and it’s something you should know before you get a quote so the number doesn’t blindside you.
How to Know When AC Repair Stops Making Financial Sense
There’s a rule of thumb the industry uses that’s actually pretty useful: if the cost of a repair exceeds 50 percent of what a new system would cost, replacement is usually the smarter financial move. A related version of this is sometimes called the $5,000 Rule — if your system is 10 or more years old and you’re looking at a repair bill of $5,000 or more, the math almost always favors replacement.
The reason is straightforward. An aging system doesn’t just break once. It breaks in a pattern. The capacitor goes, then the contactor, then you’re looking at a refrigerant leak, and somewhere in there the compressor starts struggling. Each repair buys a few more months, but the underlying problem — a system that has exceeded its useful life in a demanding climate — doesn’t go away. You’re essentially paying to keep a failing system on life support.
What makes the repair-versus-replace decision harder is that a struggling system often still runs. It just doesn’t run well. Rooms that never quite reach the set temperature, humidity that feels off even when the AC is on, an upstairs that’s always five degrees warmer than the rest of the house — these are signs the system is working harder than it should to deliver less than it used to. And all of that extra effort shows up on your CPS Energy bill before it shows up as a breakdown.
A new 18 SEER2 system compared to an older 13 or 14 SEER unit can reduce your cooling costs by 25 to 50 percent. On a summer energy bill of $350 a month, that’s $87 to $122 back in your pocket every single month. Over a 10-year ownership period in Bexar County’s climate, that’s not a rounding error — it’s a meaningful number. And with 0% financing over 60 months on qualifying systems, the monthly payment on a replacement is often less than what you’re already losing to an inefficient unit.
What a Trustworthy AC Replacement Actually Looks Like in Bexar County
The replacement process itself is where a lot of homeowners get burned — not because they made the wrong decision to replace, but because of how the replacement was handled. Sizing shortcuts, skipped permits, unlicensed installation, and warranty registrations that never get filed are all common enough that they’re worth understanding before you sign anything.
In Texas, every HVAC contractor who installs, repairs, or maintains equipment is required by law to hold an active license from the Texas Department of Licensing and Regulation — TDLR. You can verify any contractor’s license number at tdlr.texas.gov. If a contractor gets defensive when you ask for their license number, that’s your answer.
Why Proper Sizing Matters More Than Most Contractors Admit
One of the most common installation mistakes — and one that rarely shows up until it’s too late — is improper sizing. A lot of contractors size a replacement system based on the square footage of the home and call it done. The problem is that square footage alone doesn’t account for the insulation quality, window count and type, ceiling height, attic conditions, or the orientation of the home relative to the sun. In Bexar County’s climate, those variables matter enormously.
An oversized system short-cycles. It turns on, cools the air quickly, and shuts off before it’s had time to pull humidity out of the space. In a Hot-Humid climate zone like ours, that means a home that feels clammy even when the thermostat reads the right number. It also means the system is starting and stopping far more frequently than it was designed to, which accelerates wear on the compressor and shortens the system’s life.
An undersized system has the opposite problem. It runs constantly, never quite reaches the target temperature on a 102-degree afternoon, and burns itself out trying. Neither scenario is what you paid for.
The industry standard for sizing is called a Manual J Load Calculation. It’s a detailed analysis that accounts for every relevant variable in your specific home. Any contractor who skips this step and just recommends the same tonnage as your old unit is cutting a corner that will cost you — either in comfort, energy bills, or premature system failure. We perform this calculation on every replacement we do, because getting the size right the first time is the difference between a system that lasts 10 years and one that lasts 15.
There’s also the permit question. Full AC replacements in San Antonio require a mechanical permit from the City of San Antonio Development Services Department. If a contractor suggests you pull the permit yourself, or doesn’t mention it at all, that’s a serious warning sign — it’s a tactic used by unlicensed contractors to avoid the city inspection that follows permitted work.
What Happens to Your Warranty If Installation Isn't Done Right
Most major AC manufacturers — Lennox, Trane, Carrier, and others — offer a base warranty of five years on parts and equipment. That warranty extends to 10 years if the system is registered with the manufacturer within 60 days of installation. Ten years versus five is a significant difference on a system that costs $7,000 to $10,000 or more.
Here’s what a lot of homeowners don’t find out until it’s too late: manufacturers will void the 10-year warranty if the installation was performed by someone without valid credentials. A $10,000 system installed by an unlicensed contractor is a $10,000 system with no warranty protection. The savings on a cheaper quote evaporate the moment something goes wrong in year three and you’re told the warranty isn’t valid.
We handle the registration process as part of every installation we complete, because that’s part of what you’re paying for — not just the equipment and the labor, but the full protection the system is supposed to come with.
One more thing worth mentioning: when you’re replacing an AC system, it’s also the right time to look at the ductwork. Leaky ducts can reduce a new system’s cooling capacity by 20 to 30 percent, which means a brand-new, properly sized, correctly installed system still underperforms if the air is escaping before it reaches the rooms that need it. Older homes across Bexar County — in neighborhoods like Alamo Heights, Helotes, Stone Oak, and the northeast and southeast corridors — often have ductwork that’s 20 or 30 years old and was never designed to work with modern high-efficiency equipment. Addressing it during a replacement is almost always cheaper than coming back to fix it later.
We also offer duct cleaning, sealing, and indoor air quality services — humidifier and dehumidifier installation, air duct sanitizing — for homeowners who want to get the full picture addressed at once rather than in pieces.
AC Replacement in Bexar County: What to Do Before You Make Any Decisions
If your system is 10 years old or older and you’re starting to notice the signs — rooms that won’t cool down, bills that keep climbing, repairs that keep coming — you’re not imagining it. Our climate is genuinely harder on HVAC equipment than most of the country, and the math on keeping an aging system alive often doesn’t add up the way homeowners hope it will.
The most important thing you can do right now is get an honest assessment from someone who doesn’t have a financial stake in which direction you go. Our salespeople are paid a salary, not commission. When we tell you whether to repair or replace, there’s no incentive behind it other than giving you the right answer — because that’s what keeps customers coming back for 15 years, which is exactly what happens when you treat people that way.
We’re based in Converse, TX, and we serve homeowners across Bexar County — from Schertz and Live Oak to Helotes, Boerne, Floresville, Fair Oaks Ranch, and everywhere in between. If you want a straight answer about where your system stands, reach out to Texas Air Repair. We’ll tell you what we find, explain what it means, and let you decide from there.
