HVAC
HVAC Equipment Life Calculator
Weigh a repair against a replacement using the unit's age, what the repair costs and what is left in it.
Result
Service life figures are planning references, not predictions. A well-maintained unit routinely outlives them and a neglected one fails early. This does not include the efficiency difference between old and new equipment, refrigerant availability, or the comfort and reliability the customer actually cares about, and none of those are small. The decision is the owner's to make with a technician who has seen the unit.
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About this calculator
Is there a rule for repair versus replace?
The common one multiplies the unit's age by the repair cost and replaces if that exceeds the price of a new system. It is a conversation starter, not an answer, because it ignores efficiency, refrigerant type and how long the owner intends to stay.
Does this say I should replace?
No, deliberately. It gives you the cost per remaining year for both options so the choice can be made on comparable numbers. The right answer depends on things not in the calculation.
Does annual servicing really extend life?
The evidence is that it helps, mostly by catching small faults before they damage something expensive and by keeping air flow and charge correct. The adjustment used here is modest for that reason.
The formula
remaining life = typical life x maintenance adjustment - age; cost per year = repair / remaining life
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