| Business | Phone |
| Central Plumbing Heating & Ac 10097 Dudley Dr, Ijamsville 21754 | (301) 831-9972 |
| Diversified Hvac Svc 2904 Loch Haven Ct, Ijamsville 21754 | (301) 865-1530 |
| Stephen C Benner Air Cond Ijamsville 21754 | (301) 831-9131 |
| Sunline Systems 5320 Ijamsville Rd, Ijamsville 21754 | (301) 831-3100 |