HVAC Quote Comparison Calculator
Two quotes for different-size systems are hard to judge side by side. Enter each total and its system size and this tool normalizes both to dollars per ton, then flags the lower one — so you compare the price, not the packaging.
Calculator
Normalized to $/ton, Quote A is $2,000/ton and Quote B is $2,200/ton — Quote A is lower. Make sure both quotes cover the same scope (equipment tier, ductwork, permits) before you decide.
Contractors rarely quote the same system. One proposes a 3-ton unit, another a 3.5-ton; one bundles a thermostat, another does not. Comparing the two lump sums directly is misleading, because a bigger system should cost more. The fair comparison is dollars per ton of capacity: it strips out the size difference and shows which contractor is charging more for the same amount of cooling.
This tool does that normalization for you. Enter both totals and both sizes and it reports the per-ton figure for each, then flags the lower one and the gap between them. It works entirely on the numbers you enter — no stored prices, no "get three quotes" funnel.
Formula
Each quote is normalized to a per-ton price, then compared:
price_per_ton_A = quote_A / tons_A\nprice_per_ton_B = quote_B / tons_B\nlower = whichever price_per_ton is smaller
The gap is the difference between the two per-ton figures. A lower $/ton is only a genuine saving when the scope matches — same equipment tier, same ductwork, same permit and thermostat coverage.
Worked example
Quote A is $6,000 for a 3-ton system; Quote B is $7,700 for a 3.5-ton system:
price_per_ton_A = $6,000 / 3 = $2,000 / ton\nprice_per_ton_B = $7,700 / 3.5 = $2,200 / ton\nlower = Quote A (by $200 / ton)
Quote B is the larger dollar figure and the higher per-ton rate — Quote A is the better value at $2,000 per ton. But before choosing, confirm both quotes cover the same scope and that 3.5 tons is not simply an oversized system a load calculation would rule out.
A lower per-ton price is not always the deal
Normalizing to dollars per ton is powerful, but it only compares price for capacity — not quality or completeness. A contractor can post a low $/ton number by using a builder-grade unit, reusing an old line set, skipping duct sealing, or leaving the permit off the sheet. Use the scope checklist above to confirm the two proposals really are equivalent before you let the per-ton figure decide.
Size matters as much as price. If one quote is for 3 tons and another for 3.5 tons on the same house, the difference may be an honest disagreement about the load — or an oversized proposal. A professional Manual J load calculation settles the correct size; then a per-ton comparison at that size tells you who is charging fairly. This tool gives a planning estimate from your numbers, not a recommendation of any contractor.
Reference table
Check that both quotes cover the same scope before trusting the per-ton comparison:
| Line item | On both quotes? |
|---|---|
| Outdoor condenser or heat pump | Match tier (single vs. variable-speed) |
| Matched indoor coil / air handler | Included and matched |
| Line set and refrigerant | New or documented flush |
| Ductwork repair or replacement | Same scope or none |
| Thermostat and electrical | Included, not an extra |
| Permit, inspection, haul-away | Included on both |