MD HVAC

It is a multiple-choice licensing examination. The exact item count, time limit and passing score are set by the Division and its testing vendor and are not published on the DOPL HVACR page, so confirm them in your current candidate bulletin before scheduling. Practice under timed conditions so pacing is never the reason you fall short.

It is a broad trade exam rather than a deep specialty one. The challenge is coverage: refrigeration theory, heating, air distribution, electrical controls and code all count, so candidates who only know the equipment they service daily often lose points on theory, code and control wiring. Balanced preparation matters more than extra hours in your strongest area.

Start with refrigeration principles and the refrigeration cycle, since pressure/temperature relationships, superheat and subcooling underpin everything else. Move next to electrical controls and motors, then to heating systems, then air distribution and ventilation, and finish with code, safety and licensing rules - leaving review time for the domain you scored lowest on.

The retake policy, waiting period and any additional fees are set by the Division and are not stated on the HVACR licensing page. Contact the Division of Occupational and Professional Licensing directly to confirm the current rule before you reapply, and use the score report to target your weakest domain instead of repeating the same study routine.

Go to the Division of Occupational and Professional Licensing, which oversees the HVACR program. The Division is at 100 S. Charles Street, Tower I, Baltimore, MD 21201, and can be reached at 410-230-6231. Note that walk-in assistance is not available; you must schedule an in-person appointment in advance through the Division's central scheduling system.

Three recur: memorizing components without understanding the refrigeration cycle, avoiding electrical troubleshooting because it feels intimidating, and skipping code and safety sections as 'common sense.' A fourth is poor pacing - leaving questions blank at the end. Drill each domain with short timed sets and review every wrong answer until you can explain why the right one is right.

Expect practical arithmetic - airflow, load, temperature difference, Ohm's law and power calculations - rather than advanced math. For code, focus on the electrical and mechanical provisions that govern installation clearances, venting, combustion air, refrigerant safety and disconnects. Verify which code editions Maryland has adopted at the time you test.

Yes. Code, safety, installation practices and business/licensing requirements form a full domain, covering permits, inspections, contractor responsibilities and jobsite safety. Candidates who skip this section because it feels administrative routinely lose enough points to miss a pass. Treat it as an equal-weight subject, not an afterthought.