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Sources

Every claim, sourced and dated.

Every rule, cost, and rebate we cite has a link and a date. We re-check monthly. If something changes, the date below will tell you.

All sources last re-verified 2026-05-07

BAAQMD + CARB regulatory

Primary regulatory sources for Rule 9-6 and California building decarbonization standards.

SourceLink
BAAQMD Rule 9-6 pageOpen
BAAQMD Building Appliances Rule ImplementationOpen
BAAQMD Rule 9-6 Concepts Paper (Oct 2025)Open
BAAQMD Regulatory Overview (Apr 2026)Open
CARB Zero-Emission Standards FAQOpen

Rebate programs

Federal, state, and Bay Area-local rebate programs we surface in calculator results.

SourceLink
TECH Clean California IncentivesOpen
TECH HEEHRA pageOpen
CEC HEEHRA pageOpen
BayREN HPWH IncentiveOpen
ENERGY STAR 25C Tax CreditOpen

Contractor licensing

California Contractors State License Board (CSLB) sources for verifying contractor licenses, classifications, and disciplinary records.

SourceLink
CSLB Check A LicenseOpen
CSLB Public Data PortalOpen
C-36 Plumbing classificationOpen
CSLB Online Marketplace Fast FactsOpen

Spot a stale or broken citation? Email us at hello@switchboardhome.com. Source list maintained by the Switchboard Home content team.