Climate ZonesTexasHarrison

What Climate Zone is Harrison, Texas?

Harrison is in IECC Climate Zone 3A (Warm - Humid). Get accurate Manual J load calculations with official design temperatures for Harrison.

Climate Zone
3A
Winter Design
22°F
Summer Design
94°F
ZIP Codes
11

Harrison HVAC Contractors: Get Your Free Manual J Report

Climate Zone 3A requires precise load calculations. Upload your Harrison blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Harrison's exact design temperatures (22°F winter / 94°F summer).

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Verify Your Harrison ZIP Code

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

Harrison covers 11 ZIP codes: 75650, 75651, 75661, 75670, 75672, 75692, 75642, 75659, 75671, 75688 and 1 more

Harrison Design Temperatures

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

Winter 99% Design Temp
22°F
Summer 1% Design Temp
94°F
Summer Wet Bulb
75°F

IECC Requirements for Zone 3A

Minimum insulation and window requirements for Harrison per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-30
Floor Insulation:R-19
Window U-Factor:0.32
Window SHGC:0.25

Energy Code: 2021 IECC

Recommended HVAC Equipment for Harrison

Heating Systems

Gas furnace
Heat pump
Typical AFUE
90-95%

Cooling Systems

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

Related Climate Zone Pages

Learn More About
Climate Zone 3A
View All Zones in
Texas
HVAC Permits for
Harrison, Texas

Get Free Manual J Calculations for Harrison

Upload your Harrison blueprint and get a professional Manual J load calculation using official Zone 3A design temperatures. First report is FREE.

Harrison design temps
Zone 3A compliant
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