Climate ZonesMontanaPowell

Powell, Montana HVAC Climate Zone

Powell is located in IECC Climate Zone 6B (Cold - Dry). Get accurate Manual J load calculations with official design temperatures for Powell.

Climate Zone
6B
Winter Design
-13°F
Summer Design
91°F
ZIP Codes
7

Powell HVAC Contractors: Get Your Free Manual J Report

Climate Zone 6B requires precise load calculations. Upload your Powell blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Powell's exact design temperatures (-13°F winter / 91°F summer).

Claim Free Report
No credit card required

Verify Your Powell ZIP Code

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

Powell covers 7 ZIP codes: 59713, 59722, 59728, 59731, 59733, 59843, 59854

Powell Design Temperatures

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

Winter 99% Design Temp
-13°F
Summer 1% Design Temp
91°F
Summer Wet Bulb
62°F

IECC Requirements for Zone 6B

Minimum insulation and window requirements for Powell 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 Powell

Heating Systems

Gas furnace (96%+ AFUE)
Boiler
Typical AFUE
96-98%

Cooling Systems

AC (13-14 SEER, often optional)
Typical SEER
13-14 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 6B
View All Zones in
Montana
HVAC Permits for
Powell, Montana

Get Free Manual J Calculations for Powell

Upload your Powell blueprint and get a professional Manual J load calculation using official Zone 6B design temperatures. First report is FREE.

Powell design temps
Zone 6B compliant
Ready in 60 seconds
Upload Blueprint → Get Free Report

Join 10,000+ Powell contractors who trust AutoHVAC