HVAC Contractor Permit Requirements in Green Bay, WI

Complete permit and license guide for starting a hvac contractor in Green Bay, Brown County, Wisconsin.

Updated 2026-03-15 4 stops $550–$1,800 est. 7–12 weeks to obtain all licenses
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Not legal advice. Requirements may change — always verify with your local government authority before applying. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.

Federal — start here

2 stops

  1. EPA Section 608 Technician Certification

    Federal law requires all HVAC technicians who purchase or handle refrigerants to be certified under EPA Section 608 of the Clean Air Act. Certification is available in Type I (small appliances), Type II (high-pressure), Type III (low-pressure), and Universal categories. Certification is obtained through an EPA-approved testing organization such as ESCO Institute or NATE.

    Official government source

    $20–$60 (exam fee)1–2 weeks (exam scheduling)

  2. EIN (Employer Identification Number)

    Required if you have employees or operate as an LLC or corporation. Free from the IRS.

    Official government source

    FreeImmediate (online application)

State of Wisconsin

1 stop

  1. Wisconsin Department of Safety and Professional Services — HVAC Contractor License

    Wisconsin requires HVAC contractors to hold a Heating, Ventilating, and Air Conditioning (HVAC) contractor license from the Department of Safety and Professional Services (DSPS). A licensed master HVAC technician must be on staff. State exam and insurance required.

    Official government source

    $150 application fee + $75 exam fee6–10 weeks

City of Green Bay / Brown County

1 stop

  1. City of Green Bay — Mechanical Permit

    Green Bay requires a mechanical permit for HVAC installation from the Green Bay Building Inspection Office. HVAC contractors must be registered with the city.

    Official government source

    $50–$300 per project1–2 weeks

Terminus

Open for business — est. $550–$1,800 · 7–12 weeks to obtain all licenses

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Official Sources

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