Climate ZonesWashingtonTacoma

Tacoma, Washington HVAC Climate Zone

Tacoma is located in IECC Climate Zone 4C (Mixed - Marine). Get accurate Manual J load calculations with official design temperatures for Tacoma.

Climate Zone
4C
Winter Design
29°F
Summer Design
85°F
ZIP Codes
45

Tacoma HVAC Contractors: Get Your Free Manual J Report

Climate Zone 4C requires precise load calculations. Upload your Tacoma blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Tacoma's exact design temperatures (29°F winter / 85°F summer).

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Verify Your Tacoma ZIP Code

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

Tacoma covers 45 ZIP codes: 98401, 98402, 98403, 98404, 98405, 98406, 98407, 98408, 98409, 98411 and 35 more

Tacoma Design Temperatures

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

Winter 99% Design Temp
29°F
Summer 1% Design Temp
85°F
Summer Wet Bulb
67°F

IECC Requirements for Zone 4C

Minimum insulation and window requirements for Tacoma per IECC 2021.

Wall Insulation:R-20
Roof/Ceiling:R-49
Floor Insulation:R-19
Window U-Factor:0.32
Window SHGC:0.4

Energy Code: 2021 IECC

Recommended HVAC Equipment for Tacoma

Heating Systems

Gas furnace
Heat pump
Typical AFUE
92-95%

Cooling Systems

AC (optional)
Heat pump
Typical SEER
14 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 4C
View All Zones in
Washington
HVAC Permits for
Tacoma, Washington

Get Free Manual J Calculations for Tacoma

Upload your Tacoma blueprint and get a professional Manual J load calculation using official Zone 4C design temperatures. First report is FREE.

Tacoma design temps
Zone 4C compliant
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