| Business | Phone |
| A P Mechanical Inc 800 Steeles Ave W, Thornhill L4J 7L2 | (905) 669-2971 |
| Jonik Mechanical Ltd 14 Essex Ave #25, Thornhill L3T 3Z1 | (905) 881-1244 |
| M Schultz Mechanical Ltd 8 Essex Ave #19, Thornhill L3T 3Y9 | (905) 881-6444 |
| W A Stephenson Mechanical Cont 22 Essex Ave, Thornhill L3T 3Y7 | (905) 886-0934 |
| Geo A Kelson 300 Commerce Valley Dr E, Thornhill L3T 7X3 | (905) 764-0328 |