Title 24 Reports in Kern County
Kern County spans three climate zones. Bakersfield and the valley floor are one, the Mojave is another, and the Tehachapi mountains sit between them.
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Three zones and a mountain range in the middle
The valley zone covers Bakersfield and the agricultural floor around it — Shafter, Wasco, Delano, Arvin, McFarland, Taft and Buttonwillow. It is the same zone that runs north through Fresno.
South-east of Bakersfield the land climbs into the Tehachapis and the mountain zone, and beyond them drops into the Mojave, a high-desert zone taking in Mojave, California City, Ridgecrest and the eastern county.
A county crossed by the pass
Kern is where the San Joaquin Valley ends and the desert begins, and the transition is made over a mountain crossing rather than gradually. That produces three genuinely different design conditions inside one county: a hot valley with high cooling loads, a mountain zone with real heating loads, and a high desert with both.
Almost all of the county's construction sits in the valley zone, so for most applicants the answer is settled. For anything east or south of the Tehachapi crossing it is not, and valley figures would be the wrong starting point.
City and unincorporated permitting
A project inside a city's limits is permitted by that city. A project on unincorporated land is permitted by the county instead, and the two can run different submittal processes even where the energy requirements are identical. The California Energy Code itself is statewide — what changes locally is the climate zone the site falls in and how the jurisdiction wants the compliance documents presented.
Because the county contains more than one zone, the requirements are confirmed from the project ZIP code rather than from the county name.
Climate zones in Kern County
Kern County contains California climate zones 13, 14 and 16. The zone drives the insulation, glazing and equipment performance a report has to demonstrate, and it is confirmed from the project ZIP code against the Energy Commission's published table.