Repair Costs
HVAC Repair vs Replace: The Complete 2025 Guide
Everything about the 5000 Rule, real case studies, and when to override the formula.
How This Calculator Works
This calculator uses two methods to give you the most accurate recommendation:
Method 1: The 5000 Rule
The 5000 Rule is the HVAC industry's standard rule of thumb: multiply your unit's age by the repair cost. If the result exceeds $5,000 (or more practically, the cost of a new unit), replacement is typically the better investment.
Formula: Unit Age × Repair Cost > New Unit Cost = Replace
Example: 12-year-old unit + $450 repair = 12 × $450 = $5,400. If a new unit costs $5,500, this is a borderline case.
Method 2: 10-Year Cost Comparison
The 5000 Rule doesn't account for energy costs. An old, inefficient unit can cost $40-80/month more to run than a new SEER 16+ system. This calculator adds the energy cost penalty to the repair path and subtracts energy savings from the replace path for a true 10-year comparison.
| Factor | Repair Path | Replace Path |
|---|---|---|
| Upfront cost | Repair quote only | New unit installed |
| Ongoing energy | Aging unit penalty (+2%/year) | New high-efficiency unit |
| Future repairs | Older units fail more often | Typically none for 5-7 years |
| 10-year total | Repair + energy penalty + future repairs | New unit - 10yr energy savings |
Common HVAC Repair Costs (National Average)
| Repair Type | Low | Average | High |
|---|---|---|---|
| Capacitor replacement | $100 | $200 | $400 |
| Refrigerant recharge | $200 | $400 | $750 |
| Contactor replacement | $100 | $250 | $350 |
| Fan motor replacement | $250 | $450 | $700 |
| Thermostat replacement | $75 | $200 | $500 |
| Evaporator coil replacement | $600 | $1,200 | $2,500 |
| Compressor replacement | $800 | $1,500 | $3,000 |
| Full HVAC replacement | $3,500 | $5,500 | $12,000 |
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Frequently Asked Questions
The 5000 Rule states: multiply your unit's age (in years) by the repair cost. If the result exceeds $5,000 - or more practically, the cost of a new unit - you should replace rather than repair. For example, a 12-year-old unit needing a $500 repair: 12 x $500 = $6,000, suggesting replacement.
Central AC units typically last 15-20 years. Gas furnaces last 15-30 years. Heat pumps last 10-15 years. Mini-splits last 20+ years with proper maintenance. After year 10, efficiency drops and repair frequency increases significantly.
Always replace if: the unit is over 15 years old AND needs a major repair, the compressor fails on an older unit (costs 50-70% of a new unit), the heat exchanger is cracked (safety hazard), or you're using R-22 refrigerant.
Yes, significantly. A 10-year-old SEER 10 unit upgraded to SEER 18 can reduce cooling costs by 40-50%. On a $200/month electric bill with 40% HVAC usage, that's $40-80/month in savings, or $480-960/year.
Yes - always use your warranty first. Most new HVAC units come with 5-10 year parts warranties and 1-2 year labor warranties. Manufacturer warranties can cover thousands in repair costs at zero cost to you.