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California contractor license
Duke's Heating & Air Conditioning LLC
Duke's Heating & Air Conditioning LLC of Newark holds California license 860923 (C20 Warm-Air Heating, Ventilating and Air-Conditioning). The CSLB file dated Nov 1, 2026 lists it as active.1 It expires Feb 28, 2027.
Licensed 21 years, longer than 70% of 7,757 active California HVAC contractors.
Active
Duke's Heating & Air Conditioning LLC, Newark
- License
- 860923
- Class
- C20 Warm-Air Heating, Ventilating and Air-Conditioning
- Expires
- Feb 28, 2027
- Bond
- $25,000
- Workers' comp
- Insured to Jan 30, 2027
CSLB file dated Nov 1, 2026
From the CSLB file dated Nov 1, 2026. Not a consumer report; check the board before you hire.
Has the board taken action on this license?
None in the CSLB file dated Nov 1, 2026. Confirm with the board: CSLB license check
What bond, insurance and workers' comp are on file?
- Bond
- $25,000Nationwide Mutual Insurance Company, from Mar 1, 2025, continuous
- Liability insurance
- Not in the CSLB fileCheck with the board
- Workers' comp
- InsuredEmployers Compensation Insurance Company, from Jan 30, 2026, to Jan 30, 2027
Who is on this license?
- Responsible managing manager
- Milton E. DukeSince Jun 27, 2005
What work does this license cover?
Issued Jun 27, 2005. Reissued Feb 11, 2021.
Which other Newark businesses hold C20 Warm-Air Heating, Ventilating and Air-Conditioning?
- Max's HVACLicensed since 1968
- Elliott Air Systems IncLicensed since 2004
- Musial Heating & Air IncLicensed since 2004
- Copeland Mechanical IncLicensed since 2024
- Ead HVACLicensed since 2025
What should you check before hiring?
What to ask before you hire
- Get the license number in writing. The name on the license should match the name on your contract and invoice.
- Check the class covers the job. A license for one trade doesn't cover another. California license classes
- Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
- Ask who will be on site. If a crew works on your property, ask for proof of workers' comp. An exemption on file means the contractor told the CSLB it has no employees.
- Put it in a written contract: license number, price, start date and payment schedule. Check the license again on the day you sign.
If the license is lapsed
- Don't sign or pay a deposit until the CSLB shows the license active again.
- Ask the contractor why. For a bond or insurance lapse, ask for proof that the new bond or policy was filed with the CSLB, then check again.
- If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
- Check another contractor. California license lookup
Sources
- CSLB License Master (cslb.ca.gov, Nov 1, 2026)
- Contractors State License Board (CSLB)