Climate ZonesColoradoGunnison

What Climate Zone is Gunnison, Colorado?

Gunnison is in IECC Climate Zone 7 (Very Cold). Get accurate Manual J load calculations with official design temperatures for Gunnison.

Climate Zone
7
Winter Design
-18°F
Summer Design
87°F
ZIP Codes
12

Gunnison HVAC Contractors: Get Your Free Manual J Report

Climate Zone 7 requires precise load calculations. Upload your Gunnison blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Gunnison's exact design temperatures (-18°F winter / 87°F summer).

Claim Free Report
No credit card required

Verify Your Gunnison ZIP Code

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

Gunnison covers 12 ZIP codes: 81210, 81220, 81224, 81225, 81230, 81239, 81241, 81243, 81434, 81231 and 2 more

Gunnison Design Temperatures

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

Winter 99% Design Temp
-18°F
Summer 1% Design Temp
87°F
Summer Wet Bulb
70°F

IECC Requirements for Zone 7

Minimum insulation and window requirements for Gunnison per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-60
Floor Insulation:R-38
Window U-Factor:0.3
Window SHGC:0.45

Energy Code: 2021 IECC

Recommended HVAC Equipment for Gunnison

Heating Systems

Gas furnace (97%+ AFUE)
Boiler
Cold climate heat pump with backup
Typical AFUE
97-98.5%

Cooling Systems

AC (minimal, 13 SEER)
Typical SEER
13 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 7
View All Zones in
Colorado
HVAC Permits for
Gunnison, Colorado

Get Free Manual J Calculations for Gunnison

Upload your Gunnison blueprint and get a professional Manual J load calculation using official Zone 7 design temperatures. First report is FREE.

Gunnison design temps
Zone 7 compliant
Ready in 60 seconds
Upload Blueprint → Get Free Report

Join 10,000+ Gunnison contractors who trust AutoHVAC