How the data is built.

Primary sources with outbound verification:
Bureau of Labor Statistics, OES — HVAC Mechanics (SOC 49-9021)
Bureau of Labor Statistics, Producer Price Index (NAICS 238220)
Federal Reserve Economic Data (FRED)
Remodeling Magazine, Cost vs. Value Report
Additional proprietary industry pricing sources. All sources weighted by record count and recency. Index date: 2026.Q1.

Federal data (BLS, FRED) receives higher weight than industry sources due to sample size and collection rigor. Each source contributes proportionally to its record volume and publication date.

Metro-level labor multipliers derived from BLS NAICS 238220 wage data. National baseline = 1.0. Each city carries an explicit regional_multiplier reflecting local labor costs and cost of living.

The “Lowest Typical” price is the 15th percentile (P15) of verified contractor pricing in each metro. This means 15% of contractors already price at or below this level. It is not a minimum or a fantasy number — it is the statistically verified floor you can use as a negotiation anchor.

Negotiating Room = National Average − Lowest Typical. It represents the dollar gap between what the average contractor charges and what the most competitive contractors already accept. Contractor density in a metro affects this number: more contractors = more competition = more negotiating room.

The True Cost range (shown in the calculator) is derived from P25–P75 of verified pricing for a given system type, adjusted by city, home size, and system efficiency. It represents what most homeowners should expect to pay — not the cheapest or the most expensive, but the realistic range.

The index is updated quarterly. Mid-quarter updates are triggered by significant BLS data revisions or material price shifts exceeding 5% nationally.

Leonard Thompson, founder of LC Thompson Construction Co.. 20+ years in residential and commercial contracting, Jefferson City, MO. Reviews pricing methodology, fair range calculations, negotiation logic, and regional adjustments. Does not review individual city pages or calculator outputs. Full expert review →

This index does not capture: emergency/after-hours pricing, commercial-scale projects, geothermal systems, or projects requiring structural modifications. Data granularity varies by metro — smaller markets may rely more heavily on national trends. All numbers are estimates based on available data and should not substitute for multiple local contractor quotes.