| Business | Phone |
| D D Air Conditioning & Heating 14 N Carey St # 104, Baltimore 21223 | (410) 539-4000 |
| Ewell & Taylor Assoc 2301 N Charles St, Baltimore 21218 | (410) 235-6594 |
| Sid Harvery Industries Inc 8977 Yellow Brick Rd, Baltimore 21237 | (410) 574-3324 |
| Aero Heating Co 2003 Old Orems Rd, Baltimore 21220 | (410) 686-6085 |