Quick answer
Replace your central AC when it's over 12–15 years old, uses phased-out R-22 refrigerant, needs a repair costing more than about a third of a new system, or can't keep up during Puget Sound heat waves — otherwise a quality repair may safely extend its useful life several more seasons.
- Repair leans right when the unit is young (under ~10 years), maintained, and the fault is minor.
- Replace leans right with R-22 refrigerant, compressor failure, or repeated breakdowns.
- Use the one-third rule: repair cost ≥ a third of replacement on old equipment favors replacing.
- Pairing AC replacement with a heat pump can unlock rebates and add efficient heating.
You're deciding after a breakdown
A technician has quoted a repair and you're weighing whether that money is better spent toward a new high-efficiency unit — especially if your AC shares a system with a furnace or runs as the cooling side of a heat pump. This decision usually lands during the first real heat wave, when waiting weeks for a replacement isn't appealing but throwing money at an old unit feels wasteful.
You're planning ahead, not reacting
Smart timing means evaluating an aging AC in spring, before summer demand, when you can compare options calmly and schedule on your terms. If your unit is past 12 years and you've had a repair or two, a planned replacement avoids the premium and stress of an emergency swap during a July heat event.
Key terms and context
This guide is written for heating & air decisions in the Puget Sound. It uses the same terminology you'll hear from inspectors, technicians, and permit offices.
The cost of repeated repairs
Band-aid fixes on an end-of-life compressor frequently fail within the same cooling season, and each callback adds diagnostic and labor charges with nothing to show long-term. Eco presents both repair and replacement with upfront numbers so you can choose once, rather than paying in installments toward a replacement you'll need anyway.
Ignoring refrigerant type
If your system runs on R-22, every leak repair gets more expensive and harder to source, and you're investing in a platform that's already obsolete. Confirming refrigerant type early prevents pouring money into a unit that can't be economically maintained.
How we build this guidance
- Framework aligned with industry repair-vs-replace guidelines and Washington's cooling-load realities.
- Eco quotes both paths with upfront numbers so the decision is yours, made once.
- Refrigerant type and compressor condition are verified on-site before any recommendation.
Methodology: Framework aligned with industry repair-vs-replace guidelines and Washington's climate; your home needs an in-person assessment for a firm recommendation.
Last updated: 2026-06-08
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Common questions
How long do AC units last in Washington?
Typically 12–15 years with regular maintenance. Marine humidity and the corrosive air near the Sound can shorten coil life, while our short cooling season can extend it because units log fewer run-hours. Annual service and keeping the outdoor coil clean make the biggest difference.
What is the one-third rule for repair vs replace?
A common guideline: if a repair costs roughly a third or more of the price of a new system, and the unit is near or past its expected lifespan, replacement is usually the better value. For younger equipment, you'd tolerate a higher repair cost because there are many seasons left to amortize it.
My AC uses R-22 — does that mean I must replace it?
Not immediately, but it strongly tips the scale toward replacement when a refrigerant repair is needed. R-22 is phased out, so recharges are expensive and supply is limited. If your R-22 system is leak-free and running well, you can keep it; once it needs refrigerant work, replacement is usually the smarter investment.
Should I replace my AC and furnace at the same time?
Often yes, if both are aging. Matching a new AC or heat pump to an old furnace (or vice versa) can hurt efficiency and complicate warranties, and replacing together is usually cheaper than two separate projects. It's also the moment to consider a heat pump, which can capture rebates and add efficient heating.
Is it worth upgrading to a higher-efficiency unit?
It depends on how long you'll stay in the home and your current bills. Higher efficiency costs more upfront but lowers operating cost and may qualify for incentives. Because Puget Sound cooling loads are modest, the cooling-side savings alone are smaller than in hot climates — the bigger payoff comes when you also gain efficient heating from a heat pump.