Should I repair or replace my HVAC?

Repair is cheaper today. Replacement is cheaper across the years you will own the equipment when remaining life is short or the repair is a large fraction of a changeout. The 50% line is a heuristic, not a law.

What is the 50% rule?

A trade rule of thumb: if the repair is half or more of replacement, replace. It is not in any code. This tool treats it as one threshold among several.

Does refrigerant change the answer?

On a sealed-system repair, yes. New residential equipment has moved off R-410A under the AIM Act / EPA HFC phase-down. Recharging an ageing R-410A system is a decision about the next decade, not this week.

Is a cracked heat exchanger repairable?

Not as a homeowner decision. It is a replace. Do not weld it.

HVAC Repair vs Replace Calculator

Repair or replace, with the 50% rule written down as a heuristic

A $4,500 compressor on an $8,000 system is 56% of a replacement. That is a rule of thumb used in the trade, not a law. R-410A is why a “cheap” sealed-system repair may not stay cheap.

50% repair-to-replace heuristic If this repair is half or more of a replacement, remaining life is under 5 years, or a 12-year system has a compressor or coil failure — replacement is usually the cheaper order. Not a statute.

Questions this calculator answers

Should I repair or replace my HVAC?: Repair is cheaper today. Replacement is cheaper across the years you will own the equipment when remaining life is short or the repair is a large fraction of a changeout. The 50% line is a heuristic, not a law.
What is the 50% rule?: A trade rule of thumb: if the repair is half or more of replacement, replace. It is not in any code. This tool treats it as one threshold among several.
Does refrigerant change the answer?: On a sealed-system repair, yes. New residential equipment has moved off R-410A under the AIM Act / EPA HFC phase-down. Recharging an ageing R-410A system is a decision about the next decade, not this week.
Is a cracked heat exchanger repairable?: Not as a homeowner decision. It is a replace. Do not weld it.

Sources and methodology

Figures dated 23 August 2026. Last reviewed August 16, 2026.

Phasedown of Hydrofluorocarbons (US EPA, retrieved 2026-08-23. Context for R-410A as a phase-down refrigerant, not a repair-price source.)
Energy Efficient Home Improvement Credit (IRS, retrieved 2026-08-12. §25C is $0 after 31 December 2025, so a replacement is not being “paid for by the credit.”)

HVAC replacement cost Put a replacement number on the other side of the 50% test.
Repair cost estimator Diagnostic plus the quoted repair, as a fraction.
Equipment lifespan Remaining life is an input here, a range there.

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Repair or replace, with the 50% rule written down as a heuristic

Count the thresholds

Questions this calculator answers

Sources and methodology

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