| Business | Phone |
| R A Norman Heating & Air Cond Po Box 21242, Catonsville 21228 | (410) 296-3136 |
| Adam's Heating & Air Cond Co Catonsville 21228 | (410) 747-6220 |
| Affordable Heating & Cooling Catonsville 21228 | (410) 969-7246 |
| Aquatherm 6537 Baltimore National Pike, Catonsville 21228 | (410) 744-1877 |
| Catons' Plumbing Htg & A C Co 102 Bloomsbury Ave, Catonsville 21228 | (301) 776-9349 |
| Frosty Refrigeration Co 1030 Leslie Ave, Catonsville 21228 | (410) 747-2022 |
| Tra Preventive Maintenance 1216 Black Friars Rd, Catonsville 21228 | (410) 455-5200 |