What Size Mini-Split Do I Need for My Garage?

Often it changes the size class outright. Ceiling insulation and an insulated door cut the load enough that a smaller unit works and runs less. We recommend addressing insulation before buying equipment.

It runs continuously through the afternoon and never reaches setpoint on a 112-degree day. The compressor logs long hours, the room stays warm, and you conclude mini-splits do not work. The equipment was fine; the sizing was not.

No. An oversized unit cools the air quickly, shuts off, and never runs long enough to pull moisture out during monsoon season. Short cycling also wears components faster. Inverter mini-splits soften this, but they cannot erase a large sizing error.

Yes. A twelve-foot ceiling adds volume and wall area the floor-area rule ignores. Tall garages with storage racks or a vehicle lift routinely need more capacity than their footprint suggests.

Usually. A west-facing door takes the afternoon sun at the hottest part of the day, and an uninsulated steel door conducts that heat directly into the room. Orientation is one of the inputs in the load calculation.

Most garage mini-splits are heat pumps and handle Phoenix winters easily. The cooling load nearly always dominates, so a unit sized for July will have heating capacity to spare in January.

Typically under an hour. We measure the garage, note insulation and door construction, ask how you plan to use the space, and deliver a flat-rate quote in writing. There is no charge to ask for an estimate.