HVAC buying guide for King County homeowners

Plan your project

Across King County, the pattern is the same: a replacement goes well when the design work happens before the equipment is ordered. Compare HVAC options for King County homes — heat pumps, sizing, ductwork and installation scope — and insist on written, itemized bids you can compare line by line with our quote checklist.

Ask the contractor

• Will you evaluate heating and cooling loads before selecting capacity?
• How will you assess ducts, return air and airflow?
• Which specific models and efficiency ratings are proposed?
• Who handles permits, startup testing and warranties?

Check registration and compare bids

Before signing, verify the company through the Washington Labor & Industries contractor lookup and obtain written, itemized estimates. This guide does not publish an unverified “best” contractor ranking.

Reference materials

• ENERGY STAR: 10 tips for hiring a heating and cooling contractor
• ACCA: Manual S residential equipment selection
• U.S. Department of Energy: heat pump systems
• Washington L&I: verify a contractor

Need site-specific advice? Ask a qualified HVAC professional to evaluate your home.