Quick answer
Most central air conditioners in North Texas last 12 to 17 years when they're sized correctly and maintained twice a year. Our cooling season is long and brutal, the AC runs hard for months, so equipment here works more hours than the national average, and the two biggest lifespan killers are oversizing and skipped maintenance, not the brand on the label.
- Typical range: 12-17 years for a right-sized, well-maintained system in Collin County.
- A long, hot cooling season means our AC units log far more runtime than units up north.
- Oversizing is the #1 lifespan killer, short cycles wear the compressor and leave the house humid.
- Skipping the spring tune-up lets a dirty coil and low charge quietly cook the system.
- Past about year 12 with repeat repairs, it's worth running the repair-vs-replace math before peak summer.
When this question matters
You're looking at a repair quote on a system you can't quite remember the age of, you just bought an older home in McKinney, or your electric bill keeps climbing while the upstairs never gets comfortable. AC lifespan is the number behind every repair-or-replace decision, and it's easy to get talked into the wrong call in either direction. The honest answer depends on how the unit was sized for your home, how clean the coils have stayed, and whether anyone has checked the refrigerant charge in the last few summers. If you're past year 12 and seeing repeat repairs, it's worth running the math in spring, not on the hottest afternoon of July.
Why North Texas is hard on air conditioners
Our cooling season stretches across most of the year, with long stretches of triple-digit afternoons. An AC here simply runs more hours than the same model in a milder climate, and runtime is what ages the compressor, the contactor, and the blower. Add the construction dust, grass, and cottonwood that foul outdoor coils, plus hard-water scale and clay-soil settling that can stress the lineset and pad, and you have an environment that rewards right-sizing and regular maintenance, and punishes neglect faster than the brochure ever admits.
What 'end of life' actually looks like
It's rarely one dramatic failure. It's a capacitor at year 10, a contactor at 12, a refrigerant leak at 13, and a fan motor at 14, each repair reasonable on its own, but adding up to real money on equipment that's also using more electricity every summer than a modern high-SEER2 system would. When the next single repair approaches half the cost of replacement, or when an older refrigerant makes a recharge expensive, the math usually tips toward planning a replacement rather than chasing the next part.
How it works
Why runtime, not age, wears a system out
An air conditioner ages by hours run, not by birthdays. Every time the compressor starts, it draws a surge of current and the components heat and cool. A right-sized system in Collin County runs long, steady cycles and reaches its years; an oversized one satisfies the thermostat in minutes, shuts off, and fires again soon after, racking up far more start-stop wear and never running long enough to wring humidity out of the air. That's why two identical units on the same street can be in completely different shape.
Why sizing is the decision that matters most
Bigger is not safer. A unit sized two tons too large for the house short-cycles, leaves rooms uneven, keeps the home clammy, and wears out years early. Correct sizing comes from a load calculation, Manual J, that accounts for square footage, insulation, windows, and our climate, not from matching whatever was installed before. A replacement quote that doesn't mention a load calculation is repeating the last installer's guess, and that guess is often why the old unit died young.
What maintenance actually buys you
A spring tune-up cleans the outdoor coil so the system can shed heat, checks the refrigerant charge so the compressor isn't straining, tightens electrical connections, and confirms the drain isn't backing up. None of it is glamorous, but a clean, correctly charged system runs cooler, cheaper, and longer. Two visits a year, cooling in spring, heating in fall, is the single most reliable way to reach the top of the lifespan range instead of the bottom.
What to watch for
If you wait for it to die in July
Replacing an AC during a heat wave is the most expensive way to do it. Schedules are full, the house is miserable while you wait, and it's hard to make a calm, well-compared decision when you're sweating. The better path is to watch for the early signals, rising bills, repeat repairs, an older refrigerant, and plan the replacement on your timeline in spring or fall, with time to get an estimate and compare options.
If you accept a 'same size as the old one' quote
Most oversized systems got that way because someone replaced an oversized unit with another one, on autopilot. If your home has had insulation, windows, or an addition changed since the last install, the load has changed too and the size should be re-verified. Insist on a load calculation. It's the difference between a system that lasts and one that short-cycles its way to an early failure.
Why trust Burnside
- Burnside has serviced and replaced cooling systems across McKinney and Collin County since 1958.
- We're a longtime Lennox Premier Dealer and right-size every replacement to the home, not the old unit.
- Every job is flat-rate priced up front, no surprises before work starts.
Reviewed by the Burnside team, serving Collin County since 1958 · Last updated June 25, 2026
Common questions
How long should a central AC last in McKinney? +
A correctly sized, twice-a-year-maintained system typically lasts 12 to 17 years here. Oversized units or systems that never see a tune-up often fail earlier because our long, hot cooling season puts far more runtime on the equipment than a milder climate would.
Is it worth repairing an older air conditioner? +
It depends on what failed and the system's age. A capacitor or contactor on an otherwise healthy 10-year-old unit is an easy fix. A compressor or a refrigerant leak on a 14-year-old system using an older, increasingly expensive refrigerant usually points toward replacement. A good rule: if the next single repair is more than about half the replacement cost, replace.
Does a bigger AC cool my house better? +
No, oversizing is one of the most common mistakes we find. A too-large unit cools fast, shuts off, and leaves the house humid and uneven while wearing itself out with short cycles. Correct sizing from a load calculation cools more evenly, removes more humidity, and lasts longer.