Santa Barbara County is in IECC Climate Zone 3C (Warm - Marine). Get accurate Manual J load calculations with official ASHRAE design temperatures for Santa Barbara County.
Santa Barbara County, California is classified under IECC Climate Zone 3C (Warm - Marine), a mixed-climate region with marine moisture conditions. With 41 ZIP codes and 1 communities, every HVAC installation in Santa Barbara County must use the ASHRAE design temperatures of 24°F (99% winter heating) and 93°F (1% summer cooling) for accurate Manual J load calculations.
With balanced heating and cooling loads, Santa Barbara County homes require well-rounded insulation — R-20 walls, R-30 ceilings, R-19 floors — and windows with both U-factor 0.32 and SHGC 0.4 to handle both winter lows and summer highs.
Minimum insulation R-values and window performance for Climate Zone 3C in Santa Barbara County, CA.
| Building Component | Minimum Requirement | Unit |
|---|---|---|
| Ceiling / Attic Insulation | R-30 | R-value |
| Wall Insulation | R-20 | R-value |
| Floor Insulation | R-19 | R-value |
| Window U-Factor | 0.32 | BTU/hr-ft²-°F |
| Window SHGC | 0.4 | Coefficient |
| Air Infiltration | 0.15 | ACH50 |
Climate Zone 3C requires precise load calculations. Upload your Santa Barbara County blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Santa Barbara County's exact design temperatures (24°F winter / 93°F summer).
Enter your ZIP code to confirm it's in Santa Barbara County and get climate zone details.
Official ASHRAE design temperatures for Santa Barbara County, CA, used for accurate Manual J load calculations.
Minimum insulation and window requirements for Santa Barbara County per IECC 2021 energy code.
Climate Zone 3C: Warm - Marine - Mild, marine climate with cool summers and mild winters. Moderate heating needs, minimal cooling.
1 cities and communities in Santa Barbara County share Climate Zone 3C requirements.
Compare climate zones with other counties in California. Different zones require different HVAC equipment sizing.
Upload your Santa Barbara County blueprint and get a professional Manual J load calculation using official Zone 3C design temperatures. First report is FREE.
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