| Business | Phone |
| Cooltek Industries Inc 525 Northern Blvd # 202, Great Neck 11021 | (516) 829-8500 |
| Crystal Heating & Cooling 11 Northern Blvd, Great Neck 11021 | (516) 829-1195 |
| Mechanical Corp Great Neck 11020 | (516) 203-8266 |
| Systematic Control Corp 92 Northern Blvd, Great Neck 11021 | (516) 482-1374 |
| Universal Heating & Air Cond 350 Northern Blvd, Great Neck 11021 | (516) 504-1120 |