AC installation cost in Saint Paul

A central AC replacement commonly falls around $5,000 to $11,000 in the Twin Cities as of September 2026. Capacity, matched indoor and outdoor equipment, refrigerant line condition, electrical work, condensate routing, duct changes, access, and permit scope account for much of the spread. A good proposal explains the load or sizing basis and includes startup measurements. Reusing a line set or pad may reduce labor, but only if it is compatible and in good condition.