Guide · Garage mini split install: How to install a mini split in your garage.

01 · Size it

How to size a mini split for a garage

An undersized unit runs constantly and never cools the room. An oversized one short-cycles, wastes energy and handles humidity poorly.

• Measure the room

  Find the size in square feet.

• Convert to BTUs

  A rough rule is 20 BTU per sq ft, higher in Arizona.

• Adjust for the space

  Insulation, ceiling height and window count all change the number.

• Get a load calculation

  A professional Manual J load calc gives the real answer.

Rough starting point: 24,000 BTU for a poorly insulated two-car garage, 18,000 BTU with good insulation. Your space can move those numbers, which is why we do the load calc for you.

02 · Check the space

Considerations before you install

• Site inspection

  Essential, because garages vary wildly in insulation.

• Heat sources

  Expert sizing accounts for door openings, west walls and equipment heat.

• Electrical service

  The garage may need an upgrade to feed the unit.

• One unit, not more HVAC

  A single mini split is far more economical than extending central HVAC.

03 · Budget

The cost to install a mini split in a garage

Installed cost for a conventional unit typically lands between $1,000 and $4,000.

• Unit size

  A basic 12,000 BTU wall-mount trends toward the low end.

• Efficiency

  Higher SEER ratings cost more up front.

• Electrical work

  A dedicated circuit pushes a 24,000 BTU install toward the high end.

• Financing

  Wisetack financing with terms sized to fit the project. Subject to credit approval.

04 · Install

Installed, permitted and running

• Load calc

  SolarFIX sizes the unit for your garage.

• Install

  Outdoor unit, indoor head, line set and drain.

• Electrical

  Circuit work handled by the same crew.

• Permitted properly

  Right-sized and professionally installed to run for a decade or more.