By Nathan Hernandez, Owner & HVAC Expert
License # AEC01319 / LIC00252624
Last updated 2026-07-14
Multiply the repair quote by the system's age in years: under about $5,000, repair is usually rational; over it, price a replacement. Two overrides: R-22 systems almost always warrant replacement on any refrigerant repair, and systems under 10 years old almost always warrant repair.
The decision, defined
Repair-vs-replace is a cost-of-ownership question, not a loyalty question. You are weighing the repair cost plus the remaining risk in an aging system against the amortized cost of new equipment minus its efficiency savings. The '$5,000 rule' (age × repair cost) is a serviceable shortcut for the full math, and it keeps emotion out of a decision usually made on a hot day.
When repair is the right call
Repair wins when the system is under 10–12 years old, the failure is electrical (capacitor, contactor, fan motor) rather than a compressor or coil, refrigerant is the current R-410A or newer, and the system cooled the house adequately before the failure. A $400 capacitor on an 8-year-old unit is not a replacement conversation.
When replacement wins — and the failure modes of each path
Replacement wins on compressor or evaporator-coil failures past year 12, on any refrigerant repair to an R-22 system (the refrigerant is no longer produced and repair money is sunk into a dead platform), and on chronic repeat repairs — three service calls in two seasons is the system telling you something.
Each path has a failure mode. Repairing too long means paying emergency prices for parts on borrowed time, then buying a system in a heat-wave rush anyway — at the worst possible negotiating moment. Replacing too soon wastes serviceable equipment, and replacing without a load calculation bakes in comfort problems for 15 years: an oversized AC short cycles, cools unevenly, and dies young.
Proof: what the math looks like
Example with round numbers: a 16-year-old R-22 system needs a $1,800 coil repair. Age × cost = $28,800 — far past the threshold, and the repair buys refrigerant that gets scarcer every year. Compare a 9-year-old R-410A unit needing a $350 contactor: $3,150 — repair, easily. We walk homeowners through this same math on the actual quote, and we put both numbers in writing.
What to do next
Get the diagnostic first — a real one with the failed part identified and priced. Then run the rule, ask about financing if replacement wins, and insist on a load calculation before any new install. Comfy Castle offers both repair and replacement across the North and South Denver Metro, with flexible financing through Wisetack via Housecall Pro.
Frequently Asked Questions
- How do I know if my AC uses R-22?
- Check the data plate on the outdoor unit for the refrigerant type (R-22 vs. R-410A or newer). Systems installed before 2010 are the likely R-22 candidates. Any technician can confirm in seconds.
- Is it worth replacing just for efficiency savings?
- Rarely on its own in Colorado — our cooling season is short, so efficiency payback is slower than in Phoenix or Houston. Efficiency is the tiebreaker once age and repair cost already point toward replacement.
- Should I replace my furnace at the same time as my AC?
- If the furnace is a similar age, usually yes — shared labor lowers combined cost, and the blower is part of the AC system's performance. If the furnace is significantly newer, it can stay.
- Can I finance a replacement?
- Yes. Comfy Castle offers financing through Wisetack via Housecall Pro, with monthly payment options — and checking your options has no impact on your credit score.
About this guide: written from Comfy Castle Heating and Air's field experience serving the North and South Denver Metro Area, reviewed by Nathan Hernandez (Owner & HVAC Expert). We only describe services and outcomes we actually deliver — no manufacturer sponsorships, no invented statistics.