Requirements, license levels, and the issuing authority — sourced from Maryland's official board.
Dedicated state HVACR board. EPA 608 required for refrigerants.
| Requirements | Master: at least 3 years licensed as a journeyman providing all areas of HVACR services, minimum 1,875 hours in the preceding year, and pass the master exam at 70% (holding current journeyman-or-higher licensure). Master Restricted: same experience/hours/exam, restricted scope. Limited: 2 years journeyman experience, 1,000 hours in the prior year, and 70% on the limited exam. Journeyman: 4+ years as a licensed apprentice with 6,000+ training hours and 70% on the journeyman exam. Contractor levels (except journeyman) must carry general liability of at least $300,000 and property damage liability of at least $100,000. |
| Reciprocity | Not addressed on the official page reviewed. |
| Renewal | Not detailed on the official page reviewed. |
| Notes | Dedicated state HVACR board. EPA 608 required for refrigerants. |
Sources: www.labor.maryland.gov. Always confirm current requirements with the issuing authority.
New licenses, ladder upgrades, classification changes and lapses, by market and credential tier. Read the quarterly free, or license the underlying data.