| Business | Phone |
| Amko Air Conditioning & Htg 82522 Emory Grove Rd, Gaithersburg 20877 | (301) 975-0167 |
| Tuckers Air Conditioning & Htg 16100 Howard Landing Dr, Gaithersburg 20878 | (301) 670-0034 |
| Santy & Sons Air Cond & Htg Co 4401 Sundown Rd, Gaithersburg 20882 | (301) 924-1838 |
| Metropolitan Equipment Group 8625 Grovemont Cir, Gaithersburg 20877 | (301) 948-8910 |