Climate ZonesLouisianaSt. Charles

What Climate Zone is St. Charles, Louisiana?

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

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

St. Charles HVAC Contractors: Get Your Free Manual J Report

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

Claim Free Report
No credit card required

Verify Your St. Charles ZIP Code

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

St. Charles covers 10 ZIP codes: 70030, 70031, 70039, 70047, 70057, 70070, 70078, 70079, 70080, 70087

St. Charles Design Temperatures

Official ASHRAE design temperatures for St. Charles, 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 St. Charles 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: 2015 IECC

Recommended HVAC Equipment for St. Charles

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
Louisiana
HVAC Permits for
St. Charles, Louisiana

Get Free Manual J Calculations for St. Charles

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

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

Join 10,000+ St. Charles contractors who trust AutoHVAC