Title 24 Reports in San Bernardino
Most of San Bernardino is climate zone 10, but the mountain zone starts inside the city limits. The northern foothill ZIP carries zone 16.
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The mountains start inside the city
Downtown, the west side and the southern flats carry zone 10, the inland-valley designation that covers most of the Inland Empire. The 92404 ZIP on the northern edge, where the ground rises into the San Bernardino Mountains around Del Rosa and the foothills, carries zone 16.
That is a substantial jump. Zone 16 is the mountain zone and the coldest of the sixteen; zone 10 is a hot inland valley. The two demand different things of a design — one is heating-driven, the other cooling-driven — and they meet at a line running through a single city.
No neighbouring city has this
Colton, Highland, Loma Linda, Redlands and Rialto are all zone 10 throughout. San Bernardino is the only one of them that reaches high enough to pick up any zone 16, which makes the local assumption that the whole area is zone 10 true everywhere except here.
Elevation, not distance
The zone changes with height above the valley floor rather than with how far north a site is on a map, so two addresses a mile apart can differ if one is on the alluvial fan and the other is up against the range. That is why the ZIP is checked before the model is built rather than after. Permits are issued by the city; projects on unincorporated land immediately outside it go to San Bernardino County instead.
Common Title 24 Questions in San Bernardino
- Is my San Bernardino project in zone 10 or zone 16?
- Which part of San Bernardino is in the mountain zone?
- Does elevation change the climate zone within the city?
- Does a San Bernardino ADU need an energy report?
- Does the city or the county issue my permit?
San Bernardino projects fall in California climate zones 10 and 16. The zone drives the envelope and equipment requirements a report has to meet, and a single city can span more than one, so it is confirmed per address.