Class Code 5537
Workers Comp (NCCI)Heating, Ventilation & Air Conditioning — Installation, Service & Repair
HVAC contractors: installing and servicing heating, cooling, and ventilation systems, including ductwork. Covers residential and commercial service work.
Operations commonly included
- Heating and AC installation and service
- Ductwork installation
- Refrigeration service in many states
Commonly classified elsewhere
- Plumbing (5183)
- Sheet-metal shop fabrication (shop codes)
- Commercial refrigeration manufacturing
Real-world example
Install and service techs on residential systems are 5537; a fabrication shop bending duct all day may rate under a shop code.
⚠️ Common audit mistake Shop fabrication payroll left in 5537 — or worse, service payroll pushed to a cheaper shop code without a real shop.
State variation: Refrigeration and shop treatment vary by state.
Rated on: Gross payroll, per $100.
Trades that use this code
Related codes
Classification varies by state and carrier — several states use independent bureaus, and carriers file their own GL codes. Confirm your fit with a licensed agent before relying on any code. 🤝