Should You Repair or Replace Your AC? An Honest Framework

The industry shorthand: repair cost × system age ≥ 5,000 → lean replace. A modest repair on a 6-year-old system clears easily; the same repair on a 15-year-old unit doesn't. It's a sanity check, not gospel — it breaks down when the repair is a cheap consumable part on an otherwise healthy system, or when a "cheap" fix masks a terminal problem like a leaking coil.

• Compressor failure — the heart of the system and the priciest component; on an older unit this is almost always the replacement trigger.
• Evaporator or condenser coil leaks — coil replacement plus refrigerant on an aging system rarely pencils out.
• Repeat refrigerant top-offs — you're paying yearly for refrigerant that's escaping through a leak someone hasn't fixed.

By contrast, capacitors, contactors, fan motors, and thermostats are normal wear items — replacing them on a mid-life system is money well spent.

Central ACs in Iowa typically serve 12–17 years. Past 12, every major repair competes with the fact that a new system brings a fresh warranty and a large efficiency jump — today's equipment is rated under the newer SEER2 standard, and replacing a decade-old builder-grade unit typically cuts cooling energy meaningfully. Iowa's humid summers add a comfort dimension: modern variable-speed systems dehumidify dramatically better, which older single-stage units simply can't match.

One 2026-specific note: the federal 25C efficiency tax credit ended for installations after December 31, 2025 — but MidAmerican Energy rebates for qualifying high-efficiency equipment remain active. Confirm current amounts before you decide; don't let anyone sell you on an expired credit.

The worst decisions happen at 95°F with a dead system and a same-day salesman. If your AC is over 12 years old, get ahead of it: have it evaluated in spring, get the numbers in writing, and decide on your schedule. A second opinion on any four-figure repair quote is always reasonable — an honest contractor won't flinch at that.