Updated April 2026
Mini Split for Garage: Cost, Sizing, and Installation Guide
A single-zone mini split for a standard 2-car garage costs $2,500 to $5,000 installed in 2026. DIY installation with MrCool cuts the total to $1,500 to $2,500. The cost depends primarily on whether the garage is insulated and the BTU size required.
Cost by Garage Size
| Garage Type | Sq Ft | BTU (Insulated) | BTU (Uninsulated) | Installed Cost |
|---|---|---|---|---|
| 1-Car Garage | 200 - 300 | 9,000 | 12,000 | $2,000 - $3,500 |
| 2-Car Garage | 400 - 600 | 12,000 - 18,000 | 18,000 - 24,000 | $2,500 - $5,000 |
| 3-Car Garage | 600 - 900 | 18,000 - 24,000 | 24,000 - 36,000 | $3,500 - $7,000 |
Insulation Makes a Significant Difference
An uninsulated garage needs 30 to 40 BTU per square foot, while an insulated garage needs only 20 to 25 BTU per square foot. That difference often means a smaller, cheaper unit for the insulated space.
Uninsulated 2-Car Garage
24,000 BTU needed
Installed: $4,000 - $5,500
Insulated 2-Car Garage
12,000 BTU needed
Installed: $2,500 - $3,500
The math on insulating first: Insulating a 2-car garage walls and ceiling costs $1,000 to $3,000. This lets you buy a 12,000 BTU unit instead of a 24,000 BTU unit, saving $1,500 to $2,000 on the mini split. You also save 40 to 50% on monthly running costs. In most cases, insulating first pays for itself within 2 to 3 years.
Garage Installation Considerations
Indoor unit placement
Mount high on the wall, opposite the garage door. This provides the best air circulation and keeps the unit out of the way of vehicles, shelving, and equipment.
Outdoor unit placement
Place on the side of the garage, away from the driveway. Ensure 2 feet of clearance around the unit for airflow. A concrete pad or wall-mount brackets are both acceptable.
Electrical requirements
A dedicated 220V/20A circuit is required. Most garages already have a sub-panel or are close to the main panel, keeping electrical costs low ($200 to $400).
Garage door air leaks
An unsealed garage door is the biggest source of conditioned air loss. Weatherstripping the door ($50 to $200) significantly improves mini split effectiveness.
Heating vs Cooling Priority
Workshop (Heating Focus)
Need to work in the garage year-round. Heating matters most. Consider a cold-climate model (Mitsubishi Hyper Heat, Fujitsu) that maintains heating capacity below 0F. Budget models lose significant heating output below 20F.
Car Storage (Cooling Focus)
Primary goal is protecting vehicles and keeping the space comfortable when working on cars. A standard efficiency unit is fine. Even budget brands work well for summer cooling in garages.
Year-Round Use
Garage gym, home office in garage, or multi-use workshop. Size for the worst case (hottest or coldest month). A mid-range brand with good SEER and HSPF ratings is the best balance of cost and performance.
Garages Are Ideal for DIY
Garages are the easiest and most common DIY mini split installation because they offer easy exterior wall access, no aesthetic concerns about line set routing, and typically have an electrical panel or sub-panel nearby.
A 12,000 BTU MrCool DIY unit for an insulated 2-car garage costs $1,500 to $2,000 total including an electrician for the dedicated circuit. That is roughly half the cost of a professional installation.
DIY vs Pro Comparison