Climate ZonesCaliforniaLake

Lake, California HVAC Climate Zone

Lake is located in IECC Climate Zone 4B (Mixed - Dry). Get accurate Manual J load calculations with official design temperatures for Lake.

Climate Zone
4B
Winter Design
3°F
Summer Design
92°F
ZIP Codes
13

Lake HVAC Contractors: Get Your Free Manual J Report

Climate Zone 4B requires precise load calculations. Upload your Lake blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Lake's exact design temperatures (3°F winter / 92°F summer).

Claim Free Report
No credit card required

Verify Your Lake ZIP Code

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

Lake covers 13 ZIP codes: 95422, 95423, 95424, 95426, 95443, 95451, 95453, 95457, 95458, 95461 and 3 more

Lake Design Temperatures

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

Winter 99% Design Temp
3°F
Summer 1% Design Temp
92°F
Summer Wet Bulb
62°F

IECC Requirements for Zone 4B

Minimum insulation and window requirements for Lake 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: 2022 Title 24

Recommended HVAC Equipment for Lake

Heating Systems

Gas furnace (92%+ AFUE)
Typical AFUE
92-96%

Cooling Systems

AC (14-16 SEER)
Typical SEER
14-16 SEER

Related Climate Zone Pages

Learn More About
Climate Zone 4B
View All Zones in
California
HVAC Permits for
Lake, California

Get Free Manual J Calculations for Lake

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

Lake design temps
Zone 4B compliant
Ready in 60 seconds
Upload Blueprint → Get Free Report

Join 10,000+ Lake contractors who trust AutoHVAC