Climate ZonesWashingtonBenton

What Climate Zone is Benton, Washington?

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

Climate Zone
5B
Winter Design
-7°F
Summer Design
91°F
ZIP Codes
10

Benton HVAC Contractors: Get Your Free Manual J Report

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

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Verify Your Benton ZIP Code

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

Benton covers 10 ZIP codes: 99320, 99336, 99337, 99338, 99345, 99346, 99350, 99352, 99353, 99354

Benton Design Temperatures

Official ASHRAE design temperatures for Benton, 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 Benton 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 Benton

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
Washington
HVAC Permits for
Benton, Washington

Get Free Manual J Calculations for Benton

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

Benton design temps
Zone 5B compliant
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