Climate ZonesArkansasUnion

What Climate Zone is Union, Arkansas?

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

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

Union HVAC Contractors: Get Your Free Manual J Report

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

Claim Free Report
No credit card required

Verify Your Union ZIP Code

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

Union covers 11 ZIP codes: 71724, 71730, 71747, 71758, 71759, 71762, 71765, 71731, 71749, 71750 and 1 more

Union Design Temperatures

Official ASHRAE design temperatures for Union, 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 Union 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 Union

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
Arkansas
HVAC Permits for
Union, Arkansas

Get Free Manual J Calculations for Union

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

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

Join 10,000+ Union contractors who trust AutoHVAC