Redmond Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4C (marine Pacific Northwest). Redmond shares Bellevue's Eastside Seattle climate — 26°F heating design and 85°F cooling design. Marine Pacific climate with mild wet winters and warm, dry summers.

Energy Code & Manual J Requirement: Washington Energy Code (IECC 2021, Washington modified). ACCA Manual J required for residential HVAC permits in King County and Redmond jurisdictions.

Local Electric Utility: Puget Sound Energy (PSE)

Building Department: City of Redmond Permit Center

Local Trade Association: ACCA Northwest Chapter / ASHRAE Pacific Northwest Chapter