Baltimore's refrigeration work follows the port. Cold storage tied to Port of Baltimore freight and seafood processing along the Dundalk and Fells Point waterfront put most of the demand on the industrial side, not on light commercial service. Maryland's statewide average for refrigeration technicians, mechanics, and engineers is about $68,000 a year, above the national midpoint. Unlike neighboring Pennsylvania, Maryland licenses HVAC and refrigeration contractors at the state level through the Department of Labor, so the paperwork matters here (see the state license requirements guide). EPA 608 certification is federal and required anywhere you handle refrigerant.
Port-adjacent refrigerated warehousing; ammonia engine rooms, not rack service.
The other major public cold storage operator competing for the same import and export freight.
Broadline distribution with coolers, freezers, and refrigerated fleet feeding the DC-Baltimore corridor.
Chesapeake seafood processing; blast freezing and chill rooms rather than warehouse-scale systems.
Towson, Beltsville, and Aberdeen sit inside a normal service radius, and Annapolis and Frederick pull from the same labor pool. Baltimore is close enough to Washington, DC that techs routinely run routes across both markets. If you're crossing over from HVAC, the warehouse operators are the practical door because they train on their own ammonia systems; see how to become a commercial refrigeration technician.
Maryland's statewide average is around $68,000 a year. Baltimore techs compete for the same labor pool as Washington, DC contractors, which pulls wages up relative to the rest of the state, though Baltimore cost of living runs below DC.
Mostly industrial: ammonia systems in port cold storage, blast freezing and chill rooms at Chesapeake seafood processors, and refrigerated distribution. Grocery rack work exists but it is a smaller share here than in a metro without the port freight.
Maryland licenses HVAC and refrigeration contractors at the state level through the Department of Labor, so unlike Pennsylvania or Virginia you cannot rely on local rules alone. EPA 608 is federal and required on top of that if you handle refrigerant.