How we estimate hvac replacement cost
Every estimate combines a national price for each part of the job with a local labor adjustment for your state. Here is exactly how that works and where the numbers come from.
The formula
For each line item we multiply a quantity (driven by your conditioned home area, system type, efficiency tier, and whether ductwork is replaced) by a national unit cost, then apply a quality-grade factor. A regional labor multiplier is applied to the labor portion only — materials are priced nationally. We show the itemized result as a ±22% range.
National unit costs
| Line item | National unit cost | Source |
|---|---|---|
| Outdoor condenser unit | $1,200.00 / sq ft | ref |
| Furnace / heating unit | $2,200.00 / sq ft | ref |
| Evaporator coil / air handler | $1,500.00 / sq ft | ref |
| Refrigerant lineset & connections | $700.00 / sq ft | ref |
| Ductless mini-split (outdoor + heads) | $1,800.00 / sq ft | ref |
| Ductwork replacement | $4.00 / sq ft | ref |
| Installation labor | $900.00 / sq ft | ref |
| Permit, disposal & startup | $800.00 / sq ft | ref |
Regional labor multipliers
Each state's labor multiplier is its mean construction-trades wage relative to the national mean. The intended series is the U.S. Bureau of Labor Statistics Occupational Employment & Wage Statistics for HVAC mechanics (SOC 49-9021); because that all-state table could not be retrieved at build time, these figures use the cited BLS Carpenters series (SOC 47-2031) as a disclosed proxy pending verification. Multipliers are bounded to a sane range and applied to the labor share of each line item, so materials stay nationally priced while labor tracks local wages.
Data vintage & limitations
Compiled June 2026 from public cost aggregators and government wage data — these are derived estimates, not live contractor quotes. Local prices vary with project complexity, access, and material availability; always confirm with a licensed contractor before budgeting.
Sources
- https://homeguide.com/costs/hvac-cost
- https://taxfoundation.org/data/all/state/sales-tax-rates-midyear-2025/
- https://www.angi.com/articles/insider-s-price-guide-new-heating-and-cooling-system.htm
- https://www.bls.gov/ooh/construction-and-extraction/carpenters.htm
- https://www.carrier.com/residential/en/us/products/heating-cooling/hvac-replacement-cost/