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California contractor license

Atlantic Air Conditioning Inc

Atlantic Air Conditioning Inc of Diamond Bar holds California license 613226 (C20 Warm-Air Heating, Ventilating and Air-Conditioning). The CSLB file dated Oct 30, 2026 lists it as active.1 It expires Mar 31, 2027.

Licensed 35 years, longer than 87% of 7,822 active California HVAC contractors.

Active

  • Workers' comp ends Dec 1, 2026 (32 days)

Atlantic Air Conditioning Inc, Diamond Bar

License
613226
Class
C20 Warm-Air Heating, Ventilating and Air-Conditioning
Expires
Mar 31, 2027
Bond
$25,000
Workers' comp
Insured to Dec 1, 2026

CSLB file dated Oct 30, 2026

From the CSLB file dated Oct 30, 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 Oct 30, 2026. Confirm with the board: CSLB license check

What bond, insurance and workers' comp are on file?

Bond
$25,000American Contractors Indemnity Company, from Jan 1, 2023, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredMid-Century Insurance Company, from Dec 1, 2024, to Dec 1, 2026

Who is on this license?

Responsible managing officer, CEO and president
Robert S. ChangSince Mar 17, 1997

What work does this license cover?

Issued Feb 24, 1991. Reissued Mar 17, 1997.

Which other Diamond Bar businesses hold C20 Warm-Air Heating, Ventilating and Air-Conditioning?

California HVAC contractors

What should you check before hiring?

What to ask before you hire

  1. Ask whether it has been renewed. Something on this license ends within 60 days. Check again before you pay a deposit.
  2. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  3. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  4. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  5. 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.
  6. 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

  1. Don't sign or pay a deposit until the CSLB shows the license active again.
  2. 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.
  3. If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
  4. Check another contractor. California license lookup

Sources

  1. CSLB License Master (cslb.ca.gov, Oct 30, 2026)
  2. Contractors State License Board (CSLB)