Climate ZonesAlaskaNorth Slope

What Climate Zone is North Slope, Alaska?

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

Climate Zone
8
Winter Design
-42°F
Summer Design
72°F
ZIP Codes
11

North Slope HVAC Contractors: Get Your Free Manual J Report

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

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Verify Your North Slope ZIP Code

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

North Slope covers 11 ZIP codes: 99510, 99519, 99721, 99723, 99734, 99747, 99759, 99766, 99782, 99789 and 1 more

North Slope Design Temperatures

Official ASHRAE design temperatures for North Slope, 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 North Slope 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 North Slope

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
North Slope, Alaska

Get Free Manual J Calculations for North Slope

Upload your North Slope blueprint and get a professional Manual J load calculation using official Zone 8 design temperatures. First report is FREE.

North Slope design temps
Zone 8 compliant
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