Climate ZonesTexasColorado

Colorado, Texas HVAC Climate Zone

Colorado is located in IECC Climate Zone 2A (Hot - Humid). Get accurate Manual J load calculations with official design temperatures for Colorado.

Climate Zone
2A
Winter Design
32°F
Summer Design
95°F
ZIP Codes
10

Colorado HVAC Contractors: Get Your Free Manual J Report

Climate Zone 2A requires precise load calculations. Upload your Colorado blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Colorado's exact design temperatures (32°F winter / 95°F summer).

Claim Free Report
No credit card required

Verify Your Colorado ZIP Code

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

Colorado covers 10 ZIP codes: 77412, 77434, 77442, 77470, 77475, 78933, 78934, 78935, 78943, 78962

Colorado Design Temperatures

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

Winter 99% Design Temp
32°F
Summer 1% Design Temp
95°F
Summer Wet Bulb
77°F

IECC Requirements for Zone 2A

Minimum insulation and window requirements for Colorado per IECC 2021.

Wall Insulation:R-13
Roof/Ceiling:R-30
Floor Insulation:R-13
Window U-Factor:0.4
Window SHGC:0.25

Energy Code: 2021 IECC

Recommended HVAC Equipment for Colorado

Heating Systems

Gas furnace
Heat pump
Electric resistance
Typical AFUE
80-92%

Cooling Systems

AC (14-16 SEER)
Heat pump
Typical SEER
14-16 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 2A
View All Zones in
Texas
HVAC Permits for
Colorado, Texas

Get Free Manual J Calculations for Colorado

Upload your Colorado blueprint and get a professional Manual J load calculation using official Zone 2A design temperatures. First report is FREE.

Colorado design temps
Zone 2A compliant
Ready in 60 seconds
Upload Blueprint → Get Free Report

Join 10,000+ Colorado contractors who trust AutoHVAC