| Business | Phone |
| A B Jones Plumbing & Heating 5716 Industry Ln # E, Frederick 21704 | (301) 694-7792 |
| Eyler's Heating & Cooling Inc 6524 Mount Phillip Rd, Frederick 21703 | (301) 473-4978 |
| R W Warner Inc 217 Monroe Ave, Frederick 21701 | (301) 293-6044 |
| West Heating & Air Cond 323 Willow Ave, Frederick 21701 | (301) 695-1442 |