Compare · Repair, Replace & Buying
Repair or Replace Your AC? The Honest Math
Replace when the math says replace — not a minute sooner. Here's the exact framework we use in Leander homes: the age test, the 50% rule, and the refrigerant factor that's quietly changing the answer in 2026.
Reviewed by Mike Dodge, Owner of MLD Services (licensed TACLA37761C).
It's the most expensive HVAC decision a homeowner makes — and the one where you're most likely to be pushed. A volume shop earns more by replacing; an honest shop earns trust by fixing what can be fixed. At MLD Services we're repair-first by design, so here's the same framework we use on every call, laid out so you can run the numbers yourself.
What "repair vs. replace" really comes down to
Strip away the sales pitch and the decision rests on three things: age, repair cost, and the cost of running it. Get honest about those three and the answer usually becomes obvious. Below are the rules of thumb we trust — and where they break.
The two tests we run
- The age test. Most central AC systems last 12–17 years in Central Texas, a little less when they've been run hard through our long cooling season. Under 10 years, lean repair. Over 15, lean replace. In between, it's a judgment call.
- The cost test (the 50% rule + the $5,000 rule). If a single repair costs more than about half the price of a new system, replacement usually wins. A second check: multiply the repair cost by the system's age — if that number tops $5,000, replacement is usually the better long-term value. (A $400 repair on a 6-year-old unit = $2,400: fix it. A $1,000 repair on a 14-year-old unit = $14,000: think hard.)
Free tool · Central Texas
Should I repair or replace my AC?
Leaning replace — get both numbers first
The age and cost are tilting toward replacement, but it's close. Have someone you trust put the repair price and a replacement price side by side before you spend — sometimes a repair still buys you a few good years.
Age × repair = 12 × $800 = $9,600. The $5,000 rule: clear $5,000 and replacement usually wins the long game; stay under it and repair usually does. We weigh it against the system’s age, repeat repairs, and refrigerant — never a single number alone.
“One more patch” isn’t always cheaper. On an old system, small repairs stack up fast — and once R-22 or a worn compressor is involved, the next bill can dwarf the last. The honest move is to add up what you’ve already spent before you spend again.
A guideline, not a diagnosis — repair-first, with a flat written price either way.
How this verdict works
The tool weighs four signals: the $5,000 rule (age × repair cost), the age test (under ~10 years lean repair, over ~15 lean replace), how many major repairs you've had in two years, and whether the system still uses old R-22 refrigerant — which is scarce and costly since the phase-out. No single number decides it; they combine into one of four reads: repair, lean repair, lean replace, or replace.
It's a guideline, not a diagnosis. The honest call still comes from a hands-on look at the actual fault, the system's condition, and how long you plan to stay — exactly what a free second opinion gives you, with a flat written price either way. For the full picture, see the 2025 refrigerant change and what a new system costs.
When a repair is the smart move
- The system is under ~10 years old and has been maintained.
- The repair is a capacitor, contactor, fan motor, or thermostat — common, affordable fixes.
- It's your first major repair, not the third in two years.
- You may be selling soon and don't need to capture the long-term efficiency gain.
When replacement usually wins
- The system is 15+ years old and facing a major repair (compressor, coil, repeated leaks).
- Repairs are stacking up — you're nickel-and-dimed every summer.
- Energy bills keep climbing even after maintenance (see why your summer bill is high).
- It still uses R-410A and needs refrigerant work — which is now more expensive after the 2025 change.
The refrigerant factor (new in 2026)
Here's what most "fix vs. replace" articles miss: the 2025 refrigerant transition has driven up the price of R-410A — the refrigerant in most systems installed before 2025. A refrigerant leak on an older unit that once cost a couple hundred dollars to recharge can now cost meaningfully more, and that recurring cost tilts the math toward replacement for leaky, aging systems. Your current system is still perfectly legal to run and service — but it's a real factor worth knowing.
How we decide with you (the no-pressure way)
We've run this call across Leander, Cedar Park, Georgetown, Liberty Hill, and Round Rock since 2009. On every visit we diagnose the actual problem, show you what we found, and lay the numbers on the table — repair cost, system age, expected remaining life, and what a replacement would genuinely save. Then we give you our honest recommendation and a flat, written price either way. If fixing it buys you several good years, that's what we'll say. Backed by our 100% Satisfaction and Free Second Opinion guarantees and our Lifetime Workmanship Warranty.
What to do next
- Planning ahead on cost? See What a New AC Costs in Central Texas.
- Considering a different system type? Read Heat Pump vs. AC + Furnace.
- Holding a replacement quote? Get a free second opinion — we'll review it line by line, no pressure.
Or call 512-528-4258. You'll get a straight answer from a local, owner-led team.
Want a second opinion before you spend a dollar?
Send us another company's quote, or just ask a question. A licensed MLD Services pro will give you the honest, repair-first answer — with zero pressure.
Quick Answers
Frequently asked
Is it worth repairing a 12-year-old AC?
What is the 50% rule for HVAC?
Does the R-410A refrigerant change affect repair vs. replace?
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Should I repair or replace my AC?
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