Mississippi, Arkansas HVAC Climate Zone

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

Climate Zone
3A
Winter Design
22°F
Summer Design
94°F
ZIP Codes
14

Mississippi HVAC Contractors: Get Your Free Manual J Report

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

Claim Free Report
No credit card required

Verify Your Mississippi ZIP Code

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

Mississippi covers 14 ZIP codes: 72315, 72321, 72329, 72330, 72338, 72350, 72351, 72358, 72370, 72395 and 4 more

Mississippi Design Temperatures

Official ASHRAE design temperatures for Mississippi, 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 Mississippi 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 Mississippi

Heating Systems

Gas furnace
Heat pump
Typical AFUE
90-95%

Cooling Systems

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

Get Free Manual J Calculations for Mississippi

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

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

Join 10,000+ Mississippi contractors who trust AutoHVAC