Climate ZonesAlaskaBethel

What Climate Zone is Bethel, Alaska?

Bethel is in IECC Climate Zone 8 (Subarctic). Get accurate Manual J load calculations with official design temperatures for Bethel.

Climate Zone
8
Winter Design
-42°F
Summer Design
72°F
ZIP Codes
27

Bethel HVAC Contractors: Get Your Free Manual J Report

Climate Zone 8 requires precise load calculations. Upload your Bethel blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Bethel's exact design temperatures (-42°F winter / 72°F summer).

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Verify Your Bethel ZIP Code

Enter your ZIP code to confirm it's in Bethel and get climate zone details.

Bethel covers 27 ZIP codes: 99545, 99551, 99552, 99557, 99559, 99561, 99575, 99578, 99589, 99607 and 17 more

Bethel Design Temperatures

Official ASHRAE design temperatures for Bethel, used for accurate Manual J load calculations.

Winter 99% Design Temp
-42°F
Summer 1% Design Temp
72°F
Summer Wet Bulb
60°F

IECC Requirements for Zone 8

Minimum insulation and window requirements for Bethel per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-60
Floor Insulation:R-38
Window U-Factor:0.3
Window SHGC:0.5

Energy Code: 2021 IECC

Recommended HVAC Equipment for Bethel

Heating Systems

Gas furnace (98%+ AFUE)
Boiler
Oil furnace
Typical AFUE
97-98.5%

Cooling Systems

Not typically needed

Related Climate Zone Pages

Learn More About
Climate Zone 8
View All Zones in
Alaska
HVAC Permits for
Bethel, Alaska

Get Free Manual J Calculations for Bethel

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Bethel design temps
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