#1 · MERCER ISLAND
AC installation and repair used to be an afterthought in Western Washington — not anymore. Heat waves have made cooling standard, and most wet-side installs today are heat pumps or ductless mini-splits doing double duty for heat and AC.
Wet-side market range — get itemized quotes before work starts
Companies whose focus matches this work are listed first, then Mercer Island's other top-rated hvac pros. Same no-pay-to-play ranking as everywhere on Wetside Plumbing — the formula.
Includes pros based nearby in Seattle who serve Mercer Island.
Google Business data, 2026-08-07. See the full Mercer Island ranking →
Also searched as: a c contractor, ac maintenance, ac maintenances, ac repair, ac repair and installation, ac repairs.
If your home has good ducts, adding central AC or a ducted heat pump is cleanest. No ducts (common in older wet-side homes with radiators or baseboards) usually means ductless mini-splits — no duct construction, room-by-room control.
Yes — mechanical and often electrical permits. Reputable installers include them in the quote.
Ask for their Washington L&I contractor number and verify it at secure.lni.wa.gov/verify — active license, bond, and insurance. Listings above with a green badge are ones we've already matched to an active license in state records.