Garage AC Units

A garage is one of the most thermally demanding spaces in any home. Bare concrete, uninsulated metal doors, and roof assemblies with no attic buffer create heat gain that a residential-grade system consistently underestimates. A purpose-built garage AC unit sized and configured for these conditions is the only reliable answer.

Every system on this page is a ductless split: an outdoor condenser connected to a wall-mounted indoor head through a small exterior wall penetration. No ductwork, no window access, no connection to your home's existing HVAC. The system operates independently, so your garage thermostat never affects the rest of the house.

Every system is also a heat pump, delivering both cooling and heating from the same outdoor unit. A heat and AC unit for garage eliminates the need for a separate space heater, making the installation a complete year-round solution for any workshop or storage space. AC Direct has supplied HVAC at contractor wholesale pricing since 2001. All orders over $1,500 ship free.

Why Ductless Systems Are the Standard Choice for Garages

Window units require an operable window opening, which most enclosed garages lack. Portable AC units often struggle to keep pace with the heat load of a garage baking in direct sun. Extending central HVAC to a detached garage costs more in ductwork and labor than the system itself and often overloads the existing air handler.

A split AC unit for garage resolves all three problems. The compressor sits outside, so the loudest and hottest component does not add to the indoor load. The indoor head mounts high on the wall, clear of vehicles and storage. Nothing occupies a window, and nothing connects to your central system.

For any enclosed garage, an AC unit for garage with no windows installs through a single 3-inch wall penetration for the refrigerant lineset. A garage AC unit ductless setup is a permanent installation that leaves the garage fully usable.

BTU Sizing Guide for Garage AC Units

Garage AC units require 25 to 35 BTU per square foot rather than the 20 BTU per square foot standard used for insulated living spaces. Metal doors, bare walls, and unshaded roofing all contribute to heat gain that the residential formula misses.

Apply a 1.25 to 1.50 adjustment factor for garage environments using the AC Direct Mini Split Sizing Calculator. Use the higher factor for a metal-door, unfinished-wall space in the South or Southwest.

Cold-Climate Garages: Heating Performance

Every mini split garage AC unit in this catalog is a heat pump. At moderate outdoor temperatures, heat pump heating is significantly more efficient than electric resistance heating. As temperatures drop below 20 degrees Fahrenheit, output decreases, and the specific low-ambient rating of the model becomes the relevant specification.

For garages in climates with sustained sub-freezing winters, check the low-ambient heating rating before purchasing. A garage heater AC unit with extended cold-weather specifications delivers meaningful heat output below freezing, covering both seasons from a single installation without a backup heat source.

Installation: What to Know Before You Order

Installing a ductless garage mini split requires a licensed HVAC technician for refrigerant line connection and system commissioning. EPA Section 608 certification is legally required for refrigerant handling, and improper self-installation may void the factory warranty.

A single-zone garage ductless installation takes 4 to 6 hours for an experienced technician: mount the indoor head, drill the lineset penetration, set the outdoor condenser on a pad or wall bracket, pressure-test, evacuate, and commission the system. In many cases, only HVAC and basic electrical work are required for the full installation.

The recommended path is to purchase the AC unit in garage at AC Direct wholesale pricing and arrange labor separately. Supplying equipment yourself typically saves $600 to $1,500 compared to a contractor supply-and-install quote.

Buy at Wholesale—No Contractor Markup on Equipment

When you order from AC Direct, you get wholesale-direct pricing on equipment without the added retail markup typically included in contractor supply-and-install quotes. Supply the system to a local installer for labor only. The catalog above contains the best AC units for garage from brands with verified residential and commercial track records. A ductless mini split AC unit for garage at wholesale pricing with local labor is the most cost-effective path for most buyers.

• Free freight shipping on all orders over $1,500
• Same-day dispatch on most in-stock configurations
• Full factory warranty on every system
• Call 866-862-8922 Monday through Saturday for sizing support

Frequently Asked Questions

What is the best AC unit for a garage?

A ductless mini split in the 12,000 to 24,000 BTU range is the practical standard for garage cooling. It requires no window opening, handles the higher heat loads of garage environments, and operates as both a heater and cooler from one system. Every mini split in this catalog includes both cooling and heat pump heating.

How many BTU do I need for a 2-car garage?

An attached 2-car garage of 400 to 500 square feet needs 18,000 BTU under typical conditions. A detached 2-car garage or one with an uninsulated metal door should be sized to 24,000 BTU. Size at 25 to 35 BTU per square foot for any garage—not the residential 20 BTU per square foot standard.

Can I install an AC unit for garage spaces that have no windows?

Yes. Every ductless system here installs through a small exterior wall penetration for the refrigerant lineset. No window is needed at any point during installation or operation. This is the primary reason ductless is the standard approach for enclosed garages, converted workshops, and any structure where window-based cooling is impractical.

Does a garage AC unit provide heat in winter?

Every system in this catalog is a heat pump, providing both cooling and heating from the same outdoor condenser and indoor unit. For cold-climate applications, verify the model's low-ambient heating specification before purchase to confirm it matches your winter conditions.

What garage AC units should I consider based on climate? 

In moderate climates, any standard heat pump mini split sized to the garage's square footage performs well. In hot-humid climates such as Florida, the Gulf Coast, and coastal Texas, size toward the higher end of the BTU range. In cold climates where winter lows fall below 20 degrees Fahrenheit, look specifically for a model with an extended low-ambient heating rating.

What electrical circuit does a garage mini split need?

A 12,000 to 18,000 BTU system requires a dedicated 15 to 20-amp 240-volt circuit. A 24,000 BTU system needs a dedicated 20 to 25-amp 240-volt circuit. Verify that your garage electrical panel has an available slot and sufficient amperage before ordering.