HVAC System Replacement Cost in Missouri

Full HVAC system replacement in Missouri costs $8,900 to $19,400 in 2026, though city-to-city prices vary quite a bit. Heating drives most HVAC spending in Missouri: its larger communities average 4,675 heating and 1,507 cooling degree days a year.

HVAC System Replacement Prices in Missouri Cities

City	Estimate	Heating / cooling degree days
Kansas City	$8,600 to $18,800	4,613 / 1,707
St. Louis	$7,900 to $17,300	4,291 / 1,769
Springfield	$7,700 to $16,700	4,504 / 1,400
Columbia	$8,700 to $19,000	4,668 / 1,487
Independence	$8,300 to $18,100	5,206 / 1,245

From 2020 through 2025, NOAA recorded 736 winter storm and ice events, 606 heat events, 473 extreme cold events and 2,218 hail reports in Missouri. Those are the days when emergency HVAC calls pile up.

When Replacement Makes Sense

Both the heating and cooling equipment are 15 years old or more
Both units keep needing repairs
Some rooms are uncomfortable, and the energy bills are high
An old R-22 AC paired with an aging furnace

What Moves the Price

Furnace plus AC, or heat pump plus air handler
Efficiency ratings: SEER2, AFUE and HSPF2
Equipment sized to the house and climate
Duct repair or replacement
Thermostat and zoning upgrades
Permits and electrical work

Common Questions

How often should an HVAC system be replaced?

Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.

Can I replace only the AC and keep my furnace?

Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.

Other HVAC Prices in Missouri

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