47 heating specialists in Chicago, IL. 44 of them carry a Google rating, from 2.3 to 5.0 stars across 6,018 reviews — 29 sit at 4.5 or better. 47 list a phone number and 37 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.