= No License      = Mechanical License Only      = Mechanical, Electrical, & Plumbing License

Alabama • Arizona (Mech. Only) • Arkansas • California (Mech. Only) • Colorado • Delaware • District of Columbia (Mech. Only) • Florida

Georgia • Illinois • Indiana • Iowa • Kansas • Kentucky • Maryland

Massachusetts • Michigan • Minnesota • Mississippi • Missouri • Nebraska • Nevada (Mech. Only) • New Hampshire • New Jersey

New Mexico • New York • North Carolina • Ohio • Oklahoma • Pennsylvania

Rhode Island (Mech. Only) • South Carolina • South Dakota • Tennessee • Texas • Virginia • Washington • West Virginia • Wisconsin