Climate ZonesHawaiiHawaii

Hawaii, Hawaii HVAC Climate Zone

Hawaii is located in IECC Climate Zone 1A (Very Hot - Humid). Get accurate Manual J load calculations with official design temperatures for Hawaii.

Climate Zone
1A
Winter Design
44°F
Summer Design
94°F
ZIP Codes
28

Hawaii HVAC Contractors: Get Your Free Manual J Report

Climate Zone 1A requires precise load calculations. Upload your Hawaii blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Hawaii's exact design temperatures (44°F winter / 94°F summer).

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Verify Your Hawaii ZIP Code

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

Hawaii covers 28 ZIP codes: 96704, 96710, 96718, 96719, 96720, 96725, 96727, 96728, 96737, 96738 and 18 more

Hawaii Design Temperatures

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

Winter 99% Design Temp
44°F
Summer 1% Design Temp
94°F
Summer Wet Bulb
78°F

IECC Requirements for Zone 1A

Minimum insulation and window requirements for Hawaii per IECC 2021.

Wall Insulation:R-13
Roof/Ceiling:R-30
Floor Insulation:R-13
Window U-Factor:0.4
Window SHGC:0.25

Energy Code: 2021 IECC

Recommended HVAC Equipment for Hawaii

Heating Systems

Heat pump
Gas furnace (backup)
Electric resistance
Typical AFUE
80-90%

Cooling Systems

High-efficiency AC (16+ SEER)
Heat pump
Typical SEER
15-18 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 1A
View All Zones in
Hawaii
HVAC Permits for
Hawaii, Hawaii

Get Free Manual J Calculations for Hawaii

Upload your Hawaii blueprint and get a professional Manual J load calculation using official Zone 1A design temperatures. First report is FREE.

Hawaii design temps
Zone 1A compliant
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