HVAC Cost in St Louis 2026
HVAC costs in St Louis depend on system type, home size, ductwork condition, and energy efficiency rating. All installations must comply with local mechanical codes and EPA refrigerant regulations.
HVAC Cost Breakdown in St Louis 2026
Indicative rates based on recent quotes from contractors in St Louis, Missouri. Actual costs may vary based on site conditions and scope of work.
| Work Type | Min Rate | Max Rate | Unit |
|---|---|---|---|
| Central AC Installation | $3,000 | $8,000 | per unit |
| Furnace Replacement (Gas) | $2,500 | $7,000 | per unit |
| Heat Pump Installation | $4,000 | $12,000 | per unit |
| Ductwork Installation / Repair | $2,000 | $6,000 | per system |
| Mini-Split System (Single Zone) | $2,000 | $5,000 | per zone |
| AC Repair (common) | $150 | $600 | per visit |
| Thermostat Installation (Smart) | $150 | $400 | per unit |
| Annual HVAC Maintenance | $100 | $300 | per visit |
Factors Affecting HVAC Cost in St Louis
How to Save Money on HVAC in St Louis
Upgrade to a heat pump for heating and cooling in one system — eligible for federal tax credits.
Schedule installation in spring or fall for shorter wait times and potential off-season discounts.
Choose ENERGY STAR rated equipment for 15–20% energy savings.
Get annual maintenance to extend system life by 5–10 years.
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HVAC Cost FAQs – St Louis, Missouri
How much does a new HVAC system cost in St Louis?
A complete HVAC system in St Louis costs $5,000–15,000 including installation. High-efficiency heat pumps may cost more upfront but qualify for federal tax credits up to $2,000.
How long does an HVAC system last?
Central AC units last 15–20 years, furnaces 15–25 years, and heat pumps 12–20 years with proper maintenance.
Should I repair or replace my HVAC in St Louis?
Replace if your system is 15+ years old, requires frequent repairs, uses R-22 refrigerant (phased out), or your energy bills are rising. Repair if under 10 years old with a minor issue.
Do I need a permit for HVAC work in St Louis?
Yes. HVAC installations and replacements in St Louis require a mechanical permit. Your HVAC contractor handles the permit and scheduling of inspections.
HVAC Cost in Other Cities in Missouri
Compare rates across major cities in Missouri.
Other Construction Costs in St Louis
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