HVAC
HVAC Replacement ROI Calculator
Use this on an estimate. A homeowner deciding between repair and replacement wants the payback number, and most contractors never put it in front of them.
Result
Savings are modelled on the SEER ratio alone. Real results also depend on ductwork, insulation, thermostat behaviour, local energy prices and how the system is sized, so present this as an estimate, never a guarantee.
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About this calculator
Is the SEER ratio method accurate?
It is the standard first-pass estimate and it is directionally sound, but it assumes identical usage and a correctly sized system. Treat it as a conversation starter on an estimate, not an engineering calculation.
Should I include the repair cost of the old system?
If the alternative is a major repair, subtract that repair cost from the system cost to compare the two options fairly. Otherwise replacement always looks more expensive than it really is.
Can I show this to customers?
That is exactly what it is for. Contractors who put a payback figure on the estimate close more replacement work than those who present a price alone.
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