CostInMyCity

St. Louis, MO / HVAC replacement

HVAC replacement cost in St. Louis, MO

Average $7,500; common $5,000–$12,500; up to $22,000 with new ductwork. Central AC $3,900–$7,900; gas furnace $3,800–$10,000; heat pump $4,200–$7,600; labor about $1,500.

Labor for HVAC replacement in St. Louis, MO is indexed to the BLS construction-and-extraction occupations mean hourly wage for St. Louis, MO-IL of $35.43 (May 2025), applied to the 30% labor share.

City of St. Louis Building Division is the issuing office. The typical permit fee recorded from City of St. Louis mechanical permit fees (Ordinance 70800), retrieved 2026-09-01, is $65. Fee model: flat.

The national typical for this job is $7,500. Materials stay at the national figure while labor is wage-indexed for St. Louis, MO.

Typical all-in

$7,850

Job cost plus the recorded local permit fee at this size.

Low
$5,255
Typical
$7,850
High
$22,941

Breakdown

Labor (allocated)$2,336
Materials (allocated)$5,449
Job subtotal$7,785
Permit$65
All-in typical$7,850

Labor is adjusted for construction wages in this metro. Materials stay at the national figure. This is an estimate, not a contractor quote.

Permit fee

Fee model
Flat fee
Typical fee
$65
Range
$65 – $105
Retrieved
2026-09-01
  • Application fee — $25Included.
  • Combination furnace/condensing unit — $40Residential R-3 line. Included in typical/low.
  • Furnace + condensing billed separately — $80High path only: $40 + $40.

Typical/low = $25 + $40 combination = $65.00. High = $25 + $40 furnace + $40 condensing = $105.00.

Residential Use Group R3: combination furnace/condensing unit $40 plus $25 application. Documented 3-ton like-for-like split uses the combination line.

City of St. Louis mechanical permit fees (Ordinance 70800)

Citations

  1. How Much Does HVAC Replacement Cost? [2026 Data] Retrieved Aug 12, 2026. Average $7,500; $5,000–$22,000; labor about $1,500; national permit range $50–$500 (not city-specific).
  2. City of St. Louis mechanical permit fees (Ordinance 70800) Retrieved Aug 31, 2026. Residential Use Group R3: combination furnace/condensing unit $40 plus $25 application. Documented 3-ton like-for-like split uses the combination line.
  3. BLS OEWS construction wages — St. Louis, MO-IL BLS OEWS construction-and-extraction mean hourly wage / national same vintage, applied to laborShare only. Not a city-specific bid survey.

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