| Business | Phone |
| Colonial Mechanical 8516 Georgia Ave, Silver Spring 20910 | (301) 589-0379 |
| Power Max Inc Silver Spring 20910 | (301) 585-9300 |
| Paul's Heating & Air Cond 9203 New Hampshire Ave # 108, Silver Spring 20903 | (301) 439-9023 |
| H & E Mechanical Network 8508 16th St, Silver Spring 20910 | (301) 495-3190 |
| James J Madden Inc 904 Philadelphia Ave, Silver Spring 20910 | (301) 587-1710 |