Furnace Replacement Cost in Missouri

Furnace replacement in Missouri costs $3,300 to $8,200 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.

Furnace Replacement Prices in Missouri Cities

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

• The furnace is 15 to 20 years old or more
• A repair quote runs past a third of the cost of a new unit
• Gas or electric bills keep climbing even though usage hasn't changed
• Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
• A tech found a cracked heat exchanger, or the CO detector has gone off

What Moves the Price

• AFUE rating: a basic 80% unit vs. a 96% condensing furnace
• BTU size, which should come from a Manual J load calculation
• Single-stage, two-stage or modulating gas valve
• New PVC venting if you move to a condensing model
• Permit and inspection fees, which the local building department sets
• Condition of the existing ductwork and any changes it needs

Common Questions