Climate ZonesMinnesotaWinona

What Climate Zone is Winona, Minnesota?

Winona is in IECC Climate Zone 6A (Cold - Humid). Get accurate Manual J load calculations with official design temperatures for Winona.

Climate Zone
6A
Winter Design
-9°F
Summer Design
89°F
ZIP Codes
10

Winona HVAC Contractors: Get Your Free Manual J Report

Climate Zone 6A requires precise load calculations. Upload your Winona blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Winona's exact design temperatures (-9°F winter / 89°F summer).

Claim Free Report
No credit card required

Verify Your Winona ZIP Code

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

Winona covers 10 ZIP codes: 55910, 55925, 55952, 55959, 55969, 55972, 55979, 55987, 55988, 55942

Winona Design Temperatures

Official ASHRAE design temperatures for Winona, used for accurate Manual J load calculations.

Winter 99% Design Temp
-9°F
Summer 1% Design Temp
89°F
Summer Wet Bulb
73°F

IECC Requirements for Zone 6A

Minimum insulation and window requirements for Winona per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-49
Floor Insulation:R-30
Window U-Factor:0.3
Window SHGC:0.4

Energy Code: 2020 IECC

Recommended HVAC Equipment for Winona

Heating Systems

Gas furnace (96%+ AFUE)
Boiler
Cold climate heat pump
Typical AFUE
96-98%

Cooling Systems

AC (13-15 SEER)
Typical SEER
13-15 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 6A
View All Zones in
Minnesota
HVAC Permits for
Winona, Minnesota

Get Free Manual J Calculations for Winona

Upload your Winona blueprint and get a professional Manual J load calculation using official Zone 6A design temperatures. First report is FREE.

Winona design temps
Zone 6A compliant
Ready in 60 seconds
Upload Blueprint → Get Free Report

Join 10,000+ Winona contractors who trust AutoHVAC