Washington is located in IECC Climate Zone 4A (Mixed - Humid). Get accurate Manual J load calculations with official design temperatures for Washington.
Climate Zone 4A requires precise load calculations. Upload your Washington blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Washington's exact design temperatures (13°F winter / 91°F summer).
Enter your ZIP code to confirm it's in Washington and get climate zone details.
Official ASHRAE design temperatures for Washington, used for accurate Manual J load calculations.
Minimum insulation and window requirements for Washington per IECC 2021.
Energy Code: 2021 IECC
Upload your Washington blueprint and get a professional Manual J load calculation using official Zone 4A design temperatures. First report is FREE.
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