Average AC Unit Installation Cost in Missouri
$5,051
Low End
$3,279
Average
$5,051
High End
$6,879
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Use our free HVAC calculatorHere's how ac unit installation costs typically break down in Missouri:
AC Unit Installation in Missouri is 10% below the national average of $5,593. This makes Missouri one of the more affordable states for ac unit installation.
Missouri experiences a humid continental climate with hot, humid summers and cold winters, plus some of the most severe thunderstorm and tornado activity in the country. Ice storms every few winters can suspend work for a week or more, and the Kansas City and St. Louis metros sit directly on the main severe-weather corridor that shapes wind and impact specifications. For ac unit installation projects specifically, this means timing and material selection are key factors in both cost and quality.
Lower labor costs and a favorable cost of living keep home improvement pricing competitive in this state.
Missouri has no statewide general contractor license (only electrical is statewide), Kansas City, St. Louis City, St. Louis County, and Springfield run separate local programs
Evergy, Ameren Missouri, and Spire offer active 2026 rebates for heat pumps, weatherization, and smart thermostats independent of federal credit changes
Missouri sits in a severe storm and tornado corridor, ask about Class 4 impact-rated roofing and consider ICC-500 safe rooms on major rebuilds
Historic districts in St. Louis and Kansas City (and wine-country towns) enforce design review, factor 60-90 days of additional permitting for significant exterior changes
Most ac unit installation projects in Missouri require a building permit, especially if structural changes are involved. Estimated permit cost: $152.
View full permit guide for MissouriShare your project once and we'll send it to up to 3 verified ac-installation pros in your area. Free for you, free for them. Never shared with more than 3, and never with anyone we have not verified.
AC Unit Installation in Missouri typically costs between $3,279 and $6,879, with an average of $5,051 for a typical project in 2026.
No, ac unit installation in Missouri is about 10% below the national average, making it more affordable than many other states.
Permit requirements vary by city and county in Missouri. Most ac unit installation projects that involve structural changes require a building permit. Check our permit guide for Missouri for specific requirements.
A typical ac unit installation project takes 2-7 days depending on the scope, weather conditions, and contractor availability in your area.
Get at least 3 quotes from licensed contractors, consider scheduling during off-peak seasons (fall/winter), ask about financing options, and make sure to compare material options as they significantly affect the total cost.
Cost estimates are based on publicly available data and industry averages for Missouri. Actual costs vary significantly based on project specifics, contractor pricing, material choices, and local market conditions. These estimates are for informational purposes only. Always get multiple quotes from licensed contractors.