Your AC quit. The tech ran the diagnostic. The repair quote is $1,400. The system is 14 years old. Do you fix it or replace it?
Two-sentence answer: for HD homes, the $5,000 rule (age × repair cost) is a solid starting point. Apply two adjustments — does the system use R-22, and is the indoor coil leaking — and the right call is usually obvious within 5 minutes at the kitchen table.
Below is the decision framework we use on real service calls.
The $5,000 rule
Old HVAC rule of thumb that mostly still works:
Multiply the AC age (in years) by the repair quote. If the result is over $5,000, replace. If under, repair.
Examples from real HD service calls:
| AC age | Repair | Multiply | Decision |
|---|---|---|---|
| 6 yrs | $385 capacitor + contactor | $2,310 | Repair |
| 11 yrs | $620 condenser fan motor | $6,820 | Replace |
| 14 yrs | $400 leak + recharge | $5,600 | Replace |
| 18 yrs | $185 capacitor | $3,330 | Repair (short term) |
| 9 yrs | $1,800 compressor | $16,200 | Replace |
The rule’s not perfect, but it captures the basic insight: spending big on an old system is throwing money at a unit that’s probably going to fail again soon anyway.
Adjustment 1: Does it use R-22?
R-22 (the older refrigerant, phase-out completed 2020) flips the math hard. Any AC installed before 2010 likely uses R-22. Anything installed 2010-2015 is mixed — some R-22, some R-410A. After 2015 it’s all R-410A. After 2024-2025 new equipment is shifting to R-454B (A2L).
If your AC uses R-22 and the repair involves replacing or topping off refrigerant, the cost includes reclaimed R-22 at $80-$150 per pound. A typical 3-ton AC holds 6-9 lbs of refrigerant. Each leak repair recharge runs $480 to $1,350 just for the refrigerant, before labor.
Adjusted rule for R-22 systems: subtract $1,000 from your “replace” threshold. A 12-year-old R-22 system with a $400 leak repair = $4,800 by the standard rule (technically “repair”), but R-22 adjusts it down to $4,800 - $1,000 = $3,800 effective threshold. Still arguably worth repair on a one-time basis — but if you’re back in 8 months with another leak, you’re done.
We pull the equipment data plate, check refrigerant type, and tell you what you have at quote time.
Adjustment 2: Is the indoor evaporator coil leaking?
The evaporator coil (inside the air handler, usually attic-mounted in HD) is the most expensive single repair on most ACs. Coil replacement runs $1,200-$2,400 installed, plus refrigerant cost, plus the system has to be evacuated and recharged.
If the evap coil is leaking and the rest of the system is 10+ years old, you’re almost always better off replacing the whole system. Reason: the new evap coil will outlast the rest of the aging components, and you’ll be back here in 3 years replacing the condenser anyway. Doing both together costs less than doing them in sequence.
We pressure-test and leak-search every refrigerant repair call. If we find the leak in the evap coil and the system is past 10 years, the quote becomes “evap coil replacement: $1,950 / full system replacement: $11,200.” Your call.
The real decision tree
Here’s the actual decision framework, in order:
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Is the system under 5 years old? Almost always repair. Equipment is too new to give up on, and most repairs at this age are inexpensive (capacitors, contactors, sensors). Run the $5,000 rule but expect to repair.
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Is the system 5-10 years old AND on R-410A (not R-22)? Apply $5,000 rule normally. Most calls in this range land on “repair.”
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Is the system 5-10 years old AND on R-22? Apply rule with R-22 adjustment ($1,000 lower threshold). Lean toward replacement if you’ve already had one R-22 leak repair this year.
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Is the system 10-15 years old? Apply $5,000 rule. Repairs over $400 start to swing toward replace. Compressor failures swing hard.
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Is the system 15+ years old? Replace unless the repair is under $250. Statistically you’re past the useful-life curve and the next failure isn’t far away. Putting $800 into a 17-year-old AC almost always means putting another $1,200 into it within 18 months.
Replacement cost ranges (2026 HD)
| Setup | Installed cost (post-rebates) |
|---|---|
| Same-tier AC replacement (13-14 SEER → 15.5 SEER2) | $5,800-$8,400 |
| AC + furnace combined replacement | $9,400-$13,800 |
| AC → heat pump conversion (16 SEER2 / 9.5 HSPF2) | $10,000-$15,300 (after SCE rebate) |
| Premium tier (Carrier Infinity / Bosch IDS / Trane XV20i) | $13,500-$19,400 |
Numbers reflect Hesperia/Apple Valley/Victorville install pricing after typical SCE rebate ($500-$1,200). Manufacturer rebates stack on top. See our 2026 rebate hub for the full breakdown.
When repair is the right answer (despite age)
A few scenarios where we recommend repair even on older systems:
- Repair is under $250 (capacitor, contactor, thermostat). Always worth fixing.
- System uses R-410A (no R-22 penalty), is 10-12 years old, and the repair is a one-off, not a recurring leak.
- Homeowner is planning to sell within 12 months — replacing right before sale rarely pays back through sale price; getting through one more summer with a $400 repair often does.
- Cash flow tight, repair is under $800, system is otherwise stable. Patch and plan for replacement next year.
When replacement is the right answer (despite “repair” math)
- Indoor evap coil leak on a 10+ year old system. Always replace whole system.
- Multiple repair calls in the past 18 months. The pattern continues.
- R-22 system with refrigerant in the quote. The R-22 supply is going one direction and it’s not down in price.
- AC is wildly oversized (5-ton on a 1,400 sq ft house). Replacement at correct size pays back through both efficiency and proper dehumidification.
- You’re considering a heat pump anyway (eliminates the gas furnace, qualifies for SCE rebate, handles both heating and cooling on one outdoor unit).
What we tell you at the kitchen table
When we run a repair-or-replace conversation, here’s what we lay out:
- The diagnostic finding + repair quote with parts itemized
- Equipment age (from data plate)
- Refrigerant type
- SCE rebate amount for an equivalent-or-better new system
- Annual operating-cost estimate at current vs new SEER2
- Realistic payback period on the efficiency upgrade
You make the call. We don’t push replacement when repair makes sense.
When to call
Call 760-983-2326 for an honest diagnostic. We charge a flat $99 diagnostic fee that’s waived if you approve the repair or install. No commission-based sales pressure on our techs.
See our AC repair service page for ongoing repair work, AC installation page for replacement quotes, or the AC repair cost guide for full pricing. For diagnostic detail, also see AC Running But Not Cooling? 7 Causes. Replacement on the table? Run our free AC Sizing Calculator first so you know what tonnage you actually need.
