Repair or Replace Your HVAC System? (2026)
By the HomeCostLens editorial team · Reviewed January 2026
The repair-vs-replace decision for your HVAC system comes down to three things: its age, how widespread the problem is, and the cost of repair relative to replacement. As a rule of thumb, repair an isolated issue on equipment with years of life left; replace when it is near end-of-life or when repairs approach a third to half of replacement cost.
Quick decision guide
| Situation | Best move |
|---|
| AC under ~10 years / furnace under ~12, isolated part failure | Repair |
| Unit 10–15 years, still on R-410A or older refrigerant, minor issue | Repair, but plan to replace soon |
| AC 15+ years / furnace 18+ years, or rising energy bills and frequent breakdowns | Replace |
| Repair quote exceeds ~⅓–½ of replacement cost (or compressor/heat-exchanger failure) | Replace |
Cost comparison
| Option | Typical national cost | Best for |
|---|
| Typical HVAC repair | ~$150 – $1,200 | An isolated part failure on a unit with years of life left |
| AC Installation | ~$7,500 | End-of-life equipment, or when efficiency gains pay back |
| Furnace Replacement | ~$5,500 | End-of-life equipment, or when efficiency gains pay back |
| Heat Pump | ~$6,500 | End-of-life equipment, or when efficiency gains pay back |
Frequently asked questions
- Should I repair or replace my AC or furnace?
- Repair an isolated part failure on a unit with years of life left. Replace if the system is past ~15 years (AC) or ~18 (furnace), uses old refrigerant, has rising energy bills, or the repair would cost a third to half of replacement — especially a failed compressor or heat exchanger.
- How long do HVAC systems last?
- Central ACs last about 12–17 years, furnaces 15–20, and heat pumps 12–15. High-efficiency replacements often pay back part of their cost through lower energy bills.