What determines mini split cost in Phoenix
Number of zones. A single indoor head for one room is the most affordable option. Each additional zone adds an indoor unit and line set, and multi-zone outdoor units cost more.
Capacity. Phoenix rooms, especially west-facing rooms, garages, and spaces with large windows, need more capacity than generic sizing charts suggest. Undersized mini splits run constantly and never quite catch up in July.
Installation complexity. Line-set length, wall type (block vs. frame), electrical circuit availability, and whether the outdoor unit needs a pad or wall bracket all factor in.