HVAC decision tool
HVAC Repair vs Replace
Decision tool for furnaces, central AC, heat pumps, and boilers. Equipment age, repair cost, refrigerant type, and repair pattern feed a clear recommendation.
Quick answer: the 50% rule — if repair cost on equipment 10+ years old exceeds 50% of replacement, replace it. R-22 AC systems are always replace. Use the tool to score your specific situation.
Include parts + labor.
Recommendation · Confidence: medium
Repair it
Repair — but start planning for replacement
- No single factor strongly favors replacement right now.
- Equipment age (12 yr) and repair cost ($1,200) both within reasonable ranges.
- Start budgeting and researching replacement so you can act in the next off-season.
- If another major repair appears within 18 months, replace.
If you replace
- Like-for-like (95% AFUE gas furnace)$6,500
- Heat-pump replacement (heat + AC)$13,500
- Heat pump replaces both heating and AC simultaneously. State rebates can subtract $1,000–$10,000.
The 50% rule
Standard HVAC industry guidance: if a repair on equipment 10+ years old exceeds 50% of replacement cost, replace it. Energy Star and ASHRAE both reference this rule of thumb in their consumer guidance.
Your case: repair $1,200 / replacement $6,500 = 18%
Decision checklist
- · Get a second opinion if the repair exceeds $500. HVAC techs vary wildly in diagnostic accuracy.
- · Ask for the part name and number — confirms the actual problem and lets you check warranty status.
- · Check manufacturer warranty before paying out of pocket. Major components (compressor, heat exchanger) often have 10-year coverage.
- · If replacing, run a Manual J load calc — never "match the old size."
- · Get 3 quotes for replacement. Same equipment varies 30%+ in installed price.
- · Off-season pricing (April-May, September-October) is 10-20% cheaper than peak season.
- · Check state heat-pump rebate amounts before committing to like-for-like replacement.
New to the repair-vs-replace decision?
The math is rarely binary. A $1,200 repair on a 6-year-old furnace is a no-brainer fix. A $2,800 repair on a 14-year-old furnace is a coin flip — and the coin is weighted toward replacement because you’re extending the life of equipment that’s already past its prime. The decision tool weights age, repair cost, refrigerant type (R-22 = automatic replace), recent repair pattern, and rising energy bills into a single recommendation with explanation.
Read the full guide → 8-min read · the 50% rule · R-22 phase-out · heat-pump-upgrade ROI
Frequently asked questions
When is HVAC repair worth it vs replacement?
The industry rule is the "50% rule" — if a repair on equipment 10+ years old exceeds 50% of replacement cost, replace it. For younger equipment (under 8 years), repair is almost always right unless the manufacturer warranty has expired and the part is unusually expensive. End-of-life equipment (furnace 15+, boiler 25+, AC/HP 15+) is replacement territory regardless.
What is the 50% rule?
A long-standing HVAC industry guideline: if the cost of a single repair on equipment ten or more years old exceeds 50% of the cost to replace the unit, replace it. ENERGY STAR and ASHRAE both reference the rule in consumer guidance. It accounts for the fact that mid-life equipment fails again after a major repair, not less.
My AC uses R-22 Freon. Repair or replace?
Replace. R-22 refrigerant production ended January 2020. Recovered/recycled R-22 sells for $100–$200+ per pound; a typical refill costs $400–$800 just for refrigerant. Any meaningful repair on an R-22 system means putting good money into obsolete equipment. The replacement system also uses 30–40% less electricity for the same cooling.
How can I tell if my heating equipment is at end of life?
Look for: short-cycling (turns on and off rapidly), rising energy bills with consistent usage, yellow flame (gas) instead of blue, banging or rattling sounds, uneven temperatures room-to-room, and the unit running constantly during average winter days. Any one of these on equipment 15+ years old means replacement is overdue.
Is it worth upgrading to a heat pump when my AC or furnace dies?
Almost always, yes. A modern heat pump replaces both heating and cooling at roughly the cost of just one of them done separately. State rebates often subtract $1,000–$10,000. Operating cost is 30–60% lower than a gas furnace in most US states. The exceptions: ultra-cheap natural gas with very expensive electricity (rare), or a home with terrible ductwork that makes any ducted system underperform.