Ductless Mini-Split Installation in St. Louis, MO
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Cost Range
$2,300–$8,050
Local Pros
32 available
Overview
Install a ductless mini-split system for targeted heating and cooling in specific rooms or areas without existing ductwork. Ideal for additions, garages, sunrooms, and older homes.
St. Louis Climate Considerations (mixed humid)
- • Heat pump efficiency drops below 30°F
- • Ductwork condensation in summer
- • Filter neglect (dual-season use)
Common Signs You Need Ductless Mini-Split Installation
- • Room addition without ductwork
- • Converting garage or attic to living space
- • Hot or cold spots in home
- • Want zone-based temperature control
- • Sunroom or enclosed porch needs climate control
Ductless Mini-Split Installation Cost in St. Louis
Low
$2,300
Average
$5,175
High
$8,050
When to Call a Professional
Call a professional when:
Mini-split installation requires refrigerant handling, precise mounting, line set connections, and electrical work. Hire a licensed HVAC contractor experienced with ductless systems.
Hvacs in St. Louis
Dole Heating & Air Conditioning
Saint Louis, MO
(314) 631-6900Jersey heating and cooling llc
Saint Louis, MO
(314) 906-7227Welsch Heating & Cooling
Saint Louis, MO
(314) 872-8070St Louis Heating and Cooling
Saint Louis, MO
(314) 736-3400Founding Member
Premium spot in St. Louis
Ambassador
Lead the St. Louis community
Founding Member
Premium spot in St. Louis
St. Louis Housing Market
Median Household Income
$55,279
Median Home Value
$185,100
Median Rent
$978/mo
Homeownership Rate
45.4%
Population
293,109
Median Year Built
1938
Source: U.S. Census Bureau, ACS 2023 5-Year Estimates
Track This in PropDoctor
Ductless Mini-Split Installation
Date
April 2026
Cost
$5,175
Vendor
Your local pro
Warranty
10-year material warranty
St. Louis average: $2,300–$8,050
Before
Issue documented with photos
After
Repair completed, area sealed
Materials Used
Warranty Details
10-year material warranty
Auto-Checkup Created
"Mini-Split Service" — every 12 months
Property Health Score
Fair
hvac category +10 pts(68 → 78)
Your health score is calculated based on documentation completeness, maintenance currency, warranty coverage, and investment tracking.
Maintenance Plan for St. Louis
Recommended Maintenance Plan — St. Louis, Missouri
Key Risks
- • Heat pump efficiency drops below 30°F
- • Ductwork condensation in summer
- • Filter neglect (dual-season use)
- • High heat & humidity spells
- • Ice storms
Schedule
Visual inspection (DIY)(DIY)
Professional ductless mini-split installation
Estimated: $2000–$7000
Emergency inspection for damage
Estimated: $100–$300
Plan for full replacement
Estimated: $6,000–$21,000
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I found 32 HVAC technicians in your area. Here are the top results:
Smith & Sons
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J&R Home Services
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Missouri Regulations
Building Code: IRC 2018 (varies by jurisdiction)
Seller Disclosure: Sellers must complete a Seller's Disclosure Statement covering material facts about the property condition.
Natural Disaster Risks: Tornadoes, Flooding, Earthquakes (New Madrid), Ice storms