A California HVAC contractor holding a C-20 license must keep workers comp on file with the CSLB even with no employees. Payroll then follows two published wage-split pairs: heating or air conditioning equipment splits at $35.00 an hour and ductwork at $37.00, with the job's work and the carrier's determination deciding which pair applies.
HVAC contractors in California hold the C-20 Warm-Air Heating, Ventilating and Air-Conditioning license. C-20 is one of a short list of license classes the CSLB requires to carry workers comp whether or not the business has employees, so the no-employee exemption that other trades can file until January 1, 2028 isn't open to an HVAC shop. The California contractor workers comp rules explain that exemption and the rest of the state picture.
| Rule | What It Means for an HVAC Shop | Source |
|---|---|---|
| Coverage with no employees | A C-20 licensee needs a workers comp certificate or self-insurance on file even when nobody else works there. | CSLB |
| Exemption change for other trades | The exemption other classes can file today is scheduled to end on January 1, 2028; C-20 shops are already outside it. | Business and Professions Code 7125 |
| Penalties under SB 291 | A false exemption or uncovered employees can bring a minimum civil penalty of $10,000 per violation for a sole owner licensee and $20,000 for an entity. | Business and Professions Code 7125.4 |
| Unlicensed installers | A helper doing licensed HVAC work for you without a contractor license of their own is presumed to be your employee. | Labor Code 2750.5 |
| Officers and directors | One who owns at least 10% may waive coverage, effective when the insurer accepts the waiver. | Department of Insurance notice |
| Two wage lines | Equipment payroll splits at $35.00 an hour and ductwork payroll at $37.00. | WCIRB |
A one-person C-20 shop still needs a policy in place. How that policy treats the owner depends on how the business is organized, so confirm it with the carrier before relying on it. Crews that also work across the state line answer to different rules, set out in Arizona mechanical contractor workers comp and Nevada HVAC industrial insurance.
The WCIRB doesn't publish one HVAC classification. The panel for this trade shows two wage-split pairs with different lines for policies from September 1, 2026: the heating or air conditioning equipment pair divides at $35.00 an hour, the same line as California plumber workers comp, and the ductwork pair divides at $37.00, the same line used for workers comp for sheet metal contractors in California.
$35.00 an hour is the line between these published classifications
Published classifications that mention this work
The choice between the two pairs typically turns on the job, and the choice within a pair on each person's wage. Under the WCIRB's notes, when your shop runs duct at a job or location, the equipment you set there goes with the ductwork pair; equipment installed or serviced where you run no duct goes with the equipment pair. Commercial refrigeration has its own published pair, 5183(2) and 5187(2), which the panel doesn't list. The California workers comp classifications by trade list shows every pair.
Illustrative scenario
Imagine an HVAC company whose four technicians mostly replace furnaces and condensers on existing duct. One of them earns a regular wage between $35.00 and $37.00 an hour, so on service calls that payroll typically sits on the higher-wage side of the equipment pair. Then the shop wins a remodel where it runs new duct and sets the equipment. On that job the ductwork pair may apply, and the same wage falls below its line, so those hours may move to the lower-wage ductwork code. Shift the shop to Arizona or Nevada and none of this follows: those states use NCCI classifications.
Expecting the No-Employee Exemption
Owners new to the trade or the state often expect to file the CSLB's no-employee exemption. A C-20 licensee can't. A one-person HVAC shop needs a certificate on file whether or not anyone else is on payroll, and an exemption filed anyway can draw the penalties for a false one.
Once the job records and wage records line up, get a California HVAC workers comp quote.
Workers comp responds to injuries to your crew. A condensate leak that ruins a customer's ceiling, a van collision or an install dispute generally falls to general liability, commercial auto or a contractor's bond.
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The CSLB names C-20 among the license classes that must carry workers comp even with no employees on the payroll, so a solo HVAC contractor can't file the no-employee exemption other trades use. How the policy treats you as the owner depends on how the business is set up; confirm that with the carrier.
Not necessarily. Under the WCIRB's notes, equipment work goes with the ductwork pair when your shop installs duct at the same job or location, and with the equipment pair when it doesn't. A straight changeout on existing duct often falls in the equipment pair, though the carrier makes the determination.
It depends on the pair. For policies from September 1, 2026, the equipment pair splits at $35.00 an hour and the ductwork pair at $37.00. A technician paid between the two can sit on different sides of the line depending on the job, which is why job records matter.
The WCIRB publishes a separate wage-split pair for refrigeration equipment other than household units, 5183(2) and 5187(2), using the same line as the equipment pair. Shops that service walk-in coolers or display cases as well as heating and cooling may report those hours apart, depending on duties and the carrier's determination.
It often helps. Since the WCIRB ties the choice between pairs to whether your shop installed duct at that location, an auditor may ask which jobs had it. Job tickets that note new duct and who worked them let the audit follow the work.
The WCIRB's notes for the ductwork pair include making duct and fittings in your own shop when you install some of what you build. A shop that only fabricates for others may be classified differently, depending on the carrier's determination.
9 official sources
Reviewed by David Gleason, Principal, on .
Next Level Experience. Insurance Done Right.
California HVAC workers comp, from the C-20 rule to the duct split.
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