No HVAC question gets more dishonest answers than this one, because the person answering usually profits from “replace.” Here’s the math as plainly as we can lay it out.
The $5,000 rule
Repair cost × unit age. Over $5,000, lean replace. A 12-year-old unit needing a $500 blower motor? $6,000 — borderline. The same unit needing a $150 capacitor? $1,800 — repair without a second thought. A 14-year-old unit needing a $2,000 compressor? $28,000 — stop feeding it.
The South Carolina adjustment
National guides quote 15–20-year AC lifespans. Ignore them. Our cooling season runs April to October with weeks of 95°+ and humidity that never quits — systems here log roughly double the annual runtime of a Minnesota unit. 12–15 years is the honest Columbia number which shifts the repair/replace line younger than generic advice suggests.
The efficiency dividend
A 2010-era 10 SEER unit versus a modern 16 SEER2 system: that’s roughly 30–40% less electricity for the same cooling. On a Midlands home spending $200–$280/month on summer electricity, a new system can save $50–$90 monthly — $600–$1,000 per year. Factor that against the replacement cost and the payback gets short.
Rebates change the picture
High-efficiency heat pumps currently qualify for a federal tax credit up to $2,000 and utility rebates stack on top. On a $7,000–$11,000 installed replacement, incentives can knock off $2,000–$3,000. We handle the paperwork.
When repair absolutely wins
- Unit under 10 years old, any repair under $700
- Single component failure on an otherwise healthy system
- You’re selling within two years (and the system works)
When replacement absolutely wins
- Compressor or coil failure on a 12+ year unit
- R-22 refrigerant systems (refrigerant costs more than the unit is worth)
- Two or more major repairs in the past two seasons
- Rooms that never cool right — the system was never sized correctly
The honest answer depends on your unit, your repair, and your plans — which is why the estimate is free and the numbers come in writing.
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