Climate ZonesAlabamaLimestone

Limestone, Alabama HVAC Climate Zone

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

Climate Zone
3A
Winter Design
22°F
Summer Design
94°F
ZIP Codes
10

Limestone HVAC Contractors: Get Your Free Manual J Report

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

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Verify Your Limestone ZIP Code

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

Limestone covers 10 ZIP codes: 35611, 35613, 35614, 35620, 35647, 35649, 35671, 35739, 35742, 35756

Limestone Design Temperatures

Official ASHRAE design temperatures for Limestone, 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 Limestone 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: 2018 IECC

Recommended HVAC Equipment for Limestone

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
Alabama
HVAC Permits for
Limestone, Alabama

Get Free Manual J Calculations for Limestone

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Limestone design temps
Zone 3A compliant
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