Maryland
HVAC in Maryland
29 HVAC companies in the metro area within about 25 miles of Baltimore – plus how Maryland licenses HVAC work.
Metro areas
Maryland cities we cover
Across the state line
Nearby metro areas with Maryland HVAC companies
These city pages include companies based in Maryland.
Maryland rules
Do HVAC contractors need a license in Maryland?
How Maryland licenses HVAC work
HVAC contractors are licensed by the state.
License types: Master License, Master Restricted License, Limited License, Journeyman License, Journeyman Restricted License, Apprentice License.
Companies: Under Business Regulation Article 9A-301, an individual must be licensed by the Board before providing or assisting in providing heating, ventilation, air-conditioning or refrigeration services in Maryland. Contracting businesses work under a Master (all HVACR areas), Master Restricted (selected areas) or Limited (maintenance and repair only) license.
Check a license: dllr.state.md.us
Search the company's license on the Board's license search and make sure the license class (Master, Master Restricted or Limited) matches the work you are hiring them to do.
Federal rule: in every state, technicians who handle refrigerant must hold EPA Section 608 certification, whatever the state or city requires.
Sources: labor.maryland.gov, labor.maryland.gov, labor.maryland.gov, mgaleg.maryland.gov. Checked October 2026 from official sources. This is not legal advice.
Before you hire
Ask for the license number and check it on the official lookup where one exists. Ask for proof of insurance and a written, itemized estimate, and ask who pulls the permit if the job needs one – a new furnace, heat pump or air conditioner usually does.
Questions
Maryland HVAC questions
Do HVAC contractors need a license in Maryland?
Maryland licenses HVAC contractors statewide through the Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration (HVACR) Contractors (Dept. of Labor, Division of Occupational and Professional Licensing). You can check a license at dllr.state.md.us.
Where in Maryland do you list HVAC companies?
In Maryland: Baltimore (17). Each city page lists companies based within about 25 miles – 35 in smaller metro areas – whose own website names that city or nearby towns.
Do technicians need EPA certification?
Yes, in every state: federal rules require technicians who handle refrigerant to hold EPA Section 608 certification. A state or city license is a separate requirement.
How do I get an HVAC company listed in Maryland?
HVAC companies can add their business free. We check every listing against the business’s own website.
Neighboring states: Pennsylvania · Delaware · Virginia · West Virginia · District of Columbia.
Request an HVAC company
Ask us to find an HVAC company in Maryland
Tell us the job and your ZIP code. We pass it to listed companies that serve your area.
No heat in freezing weather, or no cooling in dangerous heat? Call a company from the list that says it takes emergency calls – a form is not fast enough. If you smell gas or a carbon monoxide alarm sounds, leave first and call 911 or your gas utility from outside.