| Business | Phone |
| A-1 Heating & Air Conditioning 406 Lucabaugh Mill Rd # C, Westminster 21157 | (410) 876-5909 |
| A-Quality Heating & Air Cond 213 E Main St, Westminster 21157 | (410) 751-9700 |
| Air Zone Systems Inc 525 Old Westminster Pike # A, Westminster 21157 | (410) 876-0671 |
| B & B Refrig Co Inc Westminster 21157 | (410) 848-4700 |
| Baxter Mechanical Svc 535 Old Westminster Pike, Westminster 21157 | (410) 840-4610 |
| Bob Bowers Inc 51 John St, Westminster 21157 | (410) 848-8737 |
| C & C Mechanical 1020 Beggs Rd, Westminster 21157 | (410) 840-9014 |
| Cool Breeze Westminster 21157 | (410) 840-2828 |
| Cooling & Combustion Sp 2581 Cedar Ridge Dr, Westminster 21158 | (410) 386-0381 |
| Jem Heating & Ac 150 Airport Dr # 1, Westminster 21157 | (410) 840-9328 |
| Mark A Utz & Co Inc 3433 Halter Rd, Westminster 21158 | (410) 848-5712 |
| Modern Comfort Systems 100 Airport Dr, Westminster 21157 | (410) 848-2200 |
| Myers Hvac 213 E Main St, Westminster 21157 | (410) 876-1514 |
| R E Dell Inc Westminster 21157 | (410) 876-7774 |
| R M Schmidt Inc 525 Old Westminster Pike # B2, Westminster 21157 | (410) 876-8448 |
| Siegman Forced Air 1922 Littlestown Pike, Westminster 21158 | (410) 848-6777 |