HVAC Replacement Cost in St. Louis, MO:
AC, Furnace, Heat Pump & Quotes
New HVAC system cost in St. Louis: $4,500–$9,000. Compare AC, furnace, heat pump, ductwork, warranty, permit, and rebate assumptions before you choose.
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$4,500–$9,000
Replacement Cost
3
Quotes to Compare
5–9 years
Payback Estimate
Dual-fuel heat pump or high-efficiency gas furnace + AC
Best System
Best HVAC System for St. Louis
Recommended System
Dual-fuel heat pump or high-efficiency gas furnace + AC
St. Louis's extreme temperature range makes dual-fuel systems the most efficient choice — electric heat pump for moderate cold, gas for deep freeze days.
HVAC Rebates & Incentives in St. Louis
Current HVAC rebate and tax eligibility should be verified before signing
Ameren Missouri heat pump rebates
Spire Energy high-efficiency rebates
HVAC System Comparison for St. Louis Homeowners
| System Type | Installed Cost | Efficiency | Best Climate |
|---|---|---|---|
| Central AC + Gas Furnace | $5,000–$12,000 | 13–21 SEER2 / 80–98% AFUE | Cold winters + hot summers |
| Standard Heat Pump | $4,500–$9,500 | 14–18 SEER2 | Mild winters (above 20°F) |
| Cold-Climate Heat Pump | $5,500–$12,000 | 18–22 SEER2 | Cold winters (to -15°F) |
| Dual-Fuel Heat Pump | $6,000–$13,000 | 18–22 SEER2 + 95% AFUE | All climates — most efficient |
| Ductless Mini-Split | $3,500–$9,000 | 18–26 SEER2 | No ductwork, zoned comfort |
| Geothermal Heat Pump | $15,000–$35,000 | 300–600% COP | All climates — highest ROI long-term |
Frequently Asked Questions: HVAC in St. Louis
How much does HVAC installation cost in St. Louis, MO?+
New HVAC system installation in St. Louis costs $4,500–$9,000 on average, depending on system type, home size, and whether ductwork needs replacement. Heat pump systems may qualify for federal, state, utility, or local incentives, but homeowners should confirm current rules before budgeting around them.
What is the best HVAC system for St. Louis's climate?+
The recommended system for St. Louis is the Dual-fuel heat pump or high-efficiency gas furnace + AC. St.
How do I compare HVAC savings and payback in St. Louis?+
St. Louis homeowners should compare efficiency ratings, fuel type, equipment size, utility rates, and rebate eligibility. Payback varies by home, system type, and usage, so ask each contractor to show their assumptions.
Are there HVAC rebates or tax credits available in St. Louis?+
There may be federal, utility, state, or local incentives for qualifying high-efficiency HVAC systems. Programs to check include: Ameren Missouri heat pump rebates; Spire Energy high-efficiency rebates. Ask each contractor to confirm current eligibility before you sign.
When should I replace my HVAC system in St. Louis?+
Replace your HVAC system if it's 15+ years old, needs repairs costing more than 50% of a new system's price, uses R-22 refrigerant (no longer manufactured), or your energy bills have risen significantly. Most St. Louis homeowners see payback within 5–9 years.
How do I find a reliable HVAC contractor in St. Louis?+
Look for NATE-certified technicians in St. Louis with at least 4.5 stars and recent reviews. Get 3 written quotes comparing the same equipment. Verify the contractor pulls a permit — required for HVAC work in MO.
Compare HVAC Quotes in St. Louis
Request local quote options and compare equipment, ductwork, warranty, permit handling, and rebate assumptions.