HVAC work is often split between equipment and ductwork for workers comp, and how depends on the state. California publishes separate wage-split pairs for heating or air conditioning equipment and for ductwork, while Arizona and Nevada use NCCI classifications. In each state, classification depends on the work done and the carrier's determination.
California. HVAC contractors hold the C-20 Warm-Air Heating, Ventilating and Air-Conditioning license, and C-20 is one of the license classes the CSLB requires to carry workers comp even with no employees. A one-person C-20 shop needs a policy on file, which sets California apart from most other trades. The California HVAC workers comp insurance page walks through that rule and the two wage lines.
Arizona. The Registrar of Contractors licenses this work under the C-39 and R-39 Air Conditioning and Refrigeration classes. Owner rules matter for small mechanical shops: a working LLC member or working shareholder who owns less than half the company is treated as an employee, while one who owns half or more is included only if the carrier accepts that owner by endorsement. Confirm how your owners are handled with the carrier. The owner rules, subs and audit records for Arizona are covered in Arizona HVAC workers compensation.
Nevada. Workers comp is called industrial insurance, and the State Contractors Board licenses C-21 Refrigeration and Air Conditioning. A sole proprietor may elect coverage for themselves, and from October 1, 2026 each employee's pay counts toward premium only up to a per-employee limit, $98,433.60 on policies from October 1, 2026 to December 31, 2026. The payroll limit, owner rules and audit records for Nevada are covered in Nevada HVAC workers compensation.
California's WCIRB publishes heating and air conditioning work in two places. The equipment pair splits at $35.00 an hour and the ductwork pair at $37.00, for policies from September 1, 2026. Under the WCIRB's notes, equipment set at a job where the shop also runs duct goes with the ductwork pair. Commercial refrigeration has its own published pair.
Arizona and Nevada use NCCI classifications, which this site doesn't publish, and no California code carries over. Classification depends on the duties crews actually perform and the carrier's determination; we don't assign or confirm codes. The workers comp classification codes page explains who publishes each state's list. Shops that do mostly duct fabrication can compare workers comp for sheet metal contractors.
Workers comp answers for injuries to your employees, not for a water-damaged ceiling, a service van accident or a warranty dispute. Those typically fall to general liability, commercial auto or a bond. Our sister site covers insurance for HVAC service vans and trucks.
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In California, neither exactly. The WCIRB publishes a heating or air conditioning equipment pair that shares the plumbing wage line and a ductwork pair that shares the sheet metal line. Which applies depends on the job and the carrier's determination. Arizona and Nevada use NCCI classifications instead.
In California, a C-20 licensee must keep workers comp on file with the CSLB even with no employees. In Arizona and Nevada, owner coverage follows each state's own election rules, and the carrier decides how owners are included. Confirm your situation with the carrier before you rely on any exemption.
California's CSLB uses C-20 Warm-Air Heating, Ventilating and Air-Conditioning. Arizona's Registrar of Contractors uses the C-39 and R-39 Air Conditioning and Refrigeration classes, and Nevada's State Contractors Board uses C-21 Refrigeration and Air Conditioning. Check the license detail with each board.
Payroll by technician with regular hourly rates, a rough split of service, replacement and new-construction work, any refrigeration work, your renewal month and the states you work in. A broker reviews each request, and the options can depend on size, losses and the mix of work.
Price means little until the work mix is clear. Duct installation, equipment setting and service calls may be classified differently, and equipment set where your shop also runs duct can follow the ductwork classification. A quote that reads your crew as service-only, or the reverse, may change at audit, so compare the classifications, owner rules applied and support offered. See the cheapest workers comp insurance guide.
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Reviewed by David Gleason, Principal, on .
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HVAC workers comp for heating, cooling and mechanical contractors in three states.
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