Climate ZonesIdahoIdaho

Idaho, Idaho HVAC Climate Zone

Idaho is located in IECC Climate Zone 5B (Cool - Dry). Get accurate Manual J load calculations with official design temperatures for Idaho.

Climate Zone
5B
Winter Design
-7°F
Summer Design
91°F
ZIP Codes
13

Idaho HVAC Contractors: Get Your Free Manual J Report

Climate Zone 5B requires precise load calculations. Upload your Idaho blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Idaho's exact design temperatures (-7°F winter / 91°F summer).

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Verify Your Idaho ZIP Code

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

Idaho covers 13 ZIP codes: 83522, 83525, 83526, 83530, 83533, 83536, 83539, 83542, 83547, 83549 and 3 more

Idaho Design Temperatures

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

Winter 99% Design Temp
-7°F
Summer 1% Design Temp
91°F
Summer Wet Bulb
63°F

IECC Requirements for Zone 5B

Minimum insulation and window requirements for Idaho per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-49
Floor Insulation:R-30
Window U-Factor:0.3
Window SHGC:0.4

Energy Code: 2021 IECC

Recommended HVAC Equipment for Idaho

Heating Systems

Gas furnace (95%+ AFUE)
Typical AFUE
95-98%

Cooling Systems

AC (13-15 SEER)
Typical SEER
13-15 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 5B
View All Zones in
Idaho
HVAC Permits for
Idaho, Idaho

Get Free Manual J Calculations for Idaho

Upload your Idaho blueprint and get a professional Manual J load calculation using official Zone 5B design temperatures. First report is FREE.

Idaho design temps
Zone 5B compliant
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