Heat Pump Installation Cost in St. Louis, Missouri
Expect to pay $5,100 to $12,600 for heat pump installation in St. Louis, MO. Most homeowners end up near $9,200, depending on the equipment tier and how much of the old setup can be reused.
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St. Louis Weather and HVAC Load
NOAA's 1991-2020 climate normals put St. Louis at 4,291 heating degree days and 1,769 cooling degree days per year. Heating is the bigger job here, and furnaces and heat pumps in St. Louis put in far more hours than the air conditioner. Count on roughly 79 nights below 32°F and 47 afternoons past 90°F in a typical year. Snowfall averages about 14 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 55,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 4,291 |
|---|---|
| Cooling degree days / year | 1,769 |
| Nights at or below 32°F | 79 |
| Days above 90°F | 47 |
| Average low / high | 48.9°F / 67°F |
St. Louis Housing Stock
Half the homes in St. Louis were built before 1938 (Census ACS median), so the typical house is about 88 years old. Houses that old often still have duct runs sized for an old coal or oil furnace and 60- or 100-amp electrical panels. Both can add cost when new equipment goes in. Owners live in 45.4% of occupied homes, roughly 66,000 households. The median home value is $185,100, and median household income is $55,279. We use both figures to adjust labor and pricing for this page.
NOAA storm reports for St. Louis city show 7 hail days and 12 days with damaging thunderstorm winds over the six years from 2020 to 2025. The largest hail reported was 2 inches across. Storms here are more likely to cause power surges than coil damage, so a surge protector on the outdoor unit is worth the small cost.
When It Makes Sense
- Energy bills are higher than you want them to be
- The house heats with electric baseboard, oil or propane
- Your AC needs replacing, and you'd like cheaper heat at the same time
What Moves the Price
- Backup heat, either electric strips or a gas furnace (dual-fuel)
- Size in tons, and whether the unit is cold-climate rated
- A ducted system or a ductless mini-split
- Electrical panel capacity and wiring
- Variable-speed (inverter) or single-stage compressor
For St. Louis we lowered the national figures about 7%, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- The outdoor heat pump and an indoor air handler or coil
- Thermostat setup and backup heat settings
- Line set, drain and electrical hookups
- Commissioning and warranty registration
- A load calculation and equipment selection
Missouri Permits, Efficiency Rules and Rebates
Missouri falls in the DOE's North region. New split central air conditioners must meet at least 13.4 SEER2, and heat pumps sold anywhere in the U.S. need 14.3 SEER2 and 7.5 HSPF2. Plan on a mechanical permit for most replacements in St. Louis; the contractor normally pulls it. Before you sign, ask each bidder for their Missouri license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Ask your electric utility and state energy office what heat pump rebates are open right now.
- A dual-fuel setup keeps your gas furnace as backup for the coldest nights.
- Make sure the installer sized the system for your heating load, not only cooling.
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Heat Pump Installation Questions from St. Louis Homeowners
How much is heat pump installation in St. Louis?
Plan on $5,100 to $12,600, with most jobs near $9,200. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule heat pump installation in St. Louis?
Between late spring and early fall. St. Louis averages 79 freezing nights a year, and heating calls spike from November through February.
Do heat pumps work in cold weather?
Yes. Cold-climate heat pumps keep making heat well below 0°F. They lose efficiency as it gets colder, so many homes in cold regions keep backup heat.
How long does a heat pump last?
Usually 12 to 15 years. A heat pump runs year-round, so it needs maintenance twice a year rather than once.
Heat Pump Installation Near St. Louis
- Kansas City $5,600 to $13,700
- Springfield $5,000 to $12,200
- Columbia $5,700 to $13,900
- Independence $5,400 to $13,200
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station St. Louis Sci Center; NOAA Storm Events Database 2020-2025, St. Louis city. Prices are our estimates, not contractor quotes. Updated 2026.