| Business | Phone |
| B & B Plumbing & Heating 1067 Princeton Dr, Hummelstown 17036 | (717) 566-8645 |
| Baum Plumbing & Heating 120 Graystone Dr, Hummelstown 17036 | (717) 566-2019 |
| Dave Duff Plumbing & Heating 2081 Church Rd, Hummelstown 17036 | (717) 533-0311 |
| Lister Plumbing Heating Ac 1120 W Chocolate Ave, Hummelstown 17036 | (717) 566-2408 |
| T R Arndt Plumbing Heating 6 Dunover Ct, Hummelstown 17036 | (717) 566-3997 |