Climate ZonesVermontWindsor

Windsor, Vermont HVAC Climate Zone

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

Climate Zone
6A
Winter Design
-9°F
Summer Design
89°F
ZIP Codes
33

Windsor HVAC Contractors: Get Your Free Manual J Report

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

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Verify Your Windsor ZIP Code

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

Windsor covers 33 ZIP codes: 05001, 05031, 05032, 05034, 05035, 05037, 05048, 05052, 05053, 05055 and 23 more

Windsor Design Temperatures

Official ASHRAE design temperatures for Windsor, 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 Windsor 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: 2021 IECC

Recommended HVAC Equipment for Windsor

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
Vermont
HVAC Permits for
Windsor, Vermont

Get Free Manual J Calculations for Windsor

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

Windsor design temps
Zone 6A compliant
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