Climate ZonesLouisianaSt. Mary

What Climate Zone is St. Mary, Louisiana?

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

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

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

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

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Verify Your St. Mary ZIP Code

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

St. Mary covers 10 ZIP codes: 70340, 70342, 70380, 70381, 70392, 70514, 70522, 70523, 70538, 70540

St. Mary Design Temperatures

Official ASHRAE design temperatures for St. Mary, 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. Mary 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. Mary

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. Mary, Louisiana

Get Free Manual J Calculations for St. Mary

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

St. Mary design temps
Zone 2A compliant
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