8 heating specialists in Baltimore, MD. 7 of them carry a Google rating, from 2.0 to 5.0 stars across 126 reviews — 3 sit at 4.5 or better. 8 list a phone number and 8 a website. Best-rated first; contact them yourself, we don’t resell your details.
Furnace and boiler work is gas-fitting as much as it is HVAC. Combustion, venting and carbon monoxide safety fall under different codes than refrigerant handling, and plenty of technicians hold one certification without holding the other.