California contractor license
DUFF MECHANICAL SERVICES
- C20 Warm-Air Heating, Ventilating And Air-Conditioning
DUFF MECHANICAL SERVICES is a C20 Warm-Air Heating, Ventilating And Air-Conditioning contractor in Aguanga, Riverside County, licensed in California for 3 years (since 2023). As of Dec 29, 2025, the license is active with an expiration date of Aug 31, 2027 on record and a license bond is on file.
DUFF MECHANICAL SERVICESC20 Warm-Air Heating, Ventilating And Air-Conditioning · checked Dec 29, 2025
ActiveLicense number#1109379
Licensed sinceAug 28, 2023
Years licensed3 years
Expiration on recordAug 31, 2027
City and countyAguanga, Riverside County
License bondOn file
ProjectsNone on file
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Source: California Contractors State License Board (CSLB) and City of Los Angeles permit records. Last updated Dec 29, 2025.