| Business | Phone |
| Page Mechanical Systems Inc 7628 Airpark Rd, Gaithersburg 20879 | (301) 948-9680 |
| Electro Mechanical Sales Co 8529 Muscatello Ct, Gaithersburg 20877 | (301) 519-1301 |
| Hess Construction Co Inc 704 Quince Orchard Rd # 105, Gaithersburg 20878 | (301) 670-6880 |
| Lowery Mechanical Contractors 7620 Rickenbacker Dr # E, Gaithersburg 20879 | (301) 670-9188 |
| Joshua Construction Inc 13-15 E Deer Park Dr # 200, Gaithersburg 20877 | (301) 948-6798 |