Washington climate & load drivers
- IECC climate zone: 4C-5B-6B
- Annual load split: Heating-dominant — annual heating load exceeds cooling load (4,900 HDD / 400 CDD)
- Dominant heating fuel: Electricity (heat pump) — air-source HPs as primary heat
- Dominant cooling system: Air-source heat pump providing both heating and cooling
Washington licensing & permits
- License status: Statewide license required
- License board: Washington L&I — Electrical Specialty 06A (HVAC/Refrigeration) + General Contractor registration (official site)
- Permit: L&I or local mechanical permit required
How HVAC replacement costs vary in Washington
State-specific code or insurance rule: Washington's State Building Code Council adopted code amendments effective 2024-07 (originally HB 1390 with subsequent revisions) that prescriptively favor heat pumps in new residential construction by setting compliance paths that exclude resistance-only and fossil-fuel-only systems from the energy-credit pathway — and the WA HB 1050 phase-down of high-GWP refrigerants moves WA past the federal AIM Act timeline.
Cities in Washington
Compare HVAC replacement pricing for 28 cities across Washington.
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