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Ductless mini split installation in Mesa

A mini split cools one room or zone with a wall unit and a small outdoor condenser, no ducts. It is the usual answer for a garage, casita, Arizona room or addition the main system never reached. Fixr puts installation at $4,577 to $8,328, with a $6,357 national average.

Updated October 28, 2026

  • Arizona ROC licensed companies only (how to check)
  • Price before any work starts
  • Calls and texts answered 7am to 8pm, 7 days

Where it makes sense

  • A converted garage or an Arizona room with west-facing glass.
  • A casita or guest house.
  • An addition, where stretching the old ducts would starve the rest of the house.
  • One upstairs room that never cools, when the main system is otherwise fine.

Most mini splits are heat pumps, so they heat the room in winter too.

What it costs

Fixr's figures are $4,577 to $8,328 installed, with a $6,357 average. A single-zone system for one room is at the low end. Multi-zone systems, long line sets and wall or roof work push it up.

What to ask for

  • A load calculation for the room. A garage in Mesa with an uninsulated door can need more capacity than its size suggests.
  • Where the outdoor unit goes, and how far the refrigerant lines run.
  • Where the condensate drains.
  • Whether the electrical work needs a permit. The City of Mesa says changing electrical connections needs a construction permit.
  • The SEER2 rating and the refrigerant type.

Insulate first if you can. A mini split in an uninsulated garage on a 112 degree afternoon will run all day and still lose.

Questions Mesa homeowners ask

How much does a mini split cost in Mesa?

Fixr's national figures are $4,577 to $8,328 installed, with a $6,357 average. A single room is usually at the low end.

Can a mini split cool a garage in Arizona?

Yes, if it is sized for the real load and the garage has some insulation, especially in the door. Ask for a load calculation rather than a size picked from the square footage.

Sources

  1. Fixr: Cost to Install a Ductless Air Conditioner (updated January 31, 2025)
  2. US DOE Building Science Education: Proper Sizing of HVAC Systems
  3. City of Mesa: Residential Construction Frequently Asked Questions (accessed October 28, 2026)