Should you repair or replace your AC? Three rules that decide it
When a repair quote lands, three rules of thumb cut through the guesswork — the $5,000 rule, the 50% rule, and the 3-minute rule. Here's what each one actually means, where it holds up, and where a New Braunfels homeowner should look past it.
System age × repair cost. Over $5,000 leans replace.
Use it for A costly repair on an aging system
Replace if one repair tops 50% of a new system, or the unit is 12–15+ years old.
Use it for Judging an old or worn system
Wait 3–5 minutes before restarting so the compressor can equalize pressure.
Use it for Resetting an AC that stopped cooling
What is the $5,000 rule for HVAC?
Multiply your system's age by the repair cost; if the result tops $5,000, replacement is usually the better value. A 10-year-old unit facing a $600 repair scores 6,000 — lean replace. It's a fast gut-check, not gospel: the threshold has crept up with equipment inflation (it used to be the $3,000, then $4,000 rule), so weigh it alongside the system's overall condition and warranty status.
What is the 50% rule?
Replace rather than repair when a single repair exceeds 50% of a new system's price, or when the unit is already 12–15+ years old. Age is its own trigger here. In our climate the DOE pegs average central-AC life at about 18 years, so a big repair on a system past the 12–15 year mark often means paying to extend something already near the end of its run.
What is the 3-minute rule?
After the system shuts off or trips, wait 3 to 5 minutes before restarting it. The compressor The outdoor unit that releases heat pulled from inside your home. Full definition needs time to equalize internal pressure; restarting too soon can trip the breaker and, repeated over time, wear the compressor out early. If your AC just stopped cooling, this is also the safe pause before you start the troubleshooting checks.
How does the R-410A ban change the math?
One Texas-specific factor tilts older systems toward replacement: as of January 1, 2025, new residential systems can no longer be manufactured with R-410A refrigerant The refrigerant in most pre-2025 systems. Manufacturing of new R-410A systems was banned in 2025, so parts will get scarcer. Full definition . Existing R-410A systems are still legal to service, but the refrigerant and parts grow scarcer and pricier each year, so a large repair on an R-410A unit buys less runway than it used to. U.S. EPA (HFC phasedown)