Climate ZonesLouisianaWebster

What Climate Zone is Webster, Louisiana?

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

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

Webster HVAC Contractors: Get Your Free Manual J Report

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

Claim Free Report
No credit card required

Verify Your Webster ZIP Code

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

Webster covers 11 ZIP codes: 71018, 71021, 71023, 71024, 71039, 71055, 71058, 71071, 71072, 71073 and 1 more

Webster Design Temperatures

Official ASHRAE design temperatures for Webster, 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 Webster 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: 2015 IECC

Recommended HVAC Equipment for Webster

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
Louisiana
HVAC Permits for
Webster, Louisiana

Get Free Manual J Calculations for Webster

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

Webster design temps
Zone 3A compliant
Ready in 60 seconds
Upload Blueprint → Get Free Report

Join 10,000+ Webster contractors who trust AutoHVAC