| Business | Phone |
| Aac Action Air Control 8400 Woodbine Ave #B, Markham L3R 4N7 | (416) 229-2767 |
| Aac Authorized Air Control 8370 Woodbine Ave, Markham L3R 2N8 | (905) 415-4720 |
| Aire One Heating & Cooling Inc 2800 John St #9, Markham L3R 0E2 | (416) 460-5300 |
| Associated Mechanical Svc Inc 15 Heritage Rd #8, Markham L3P 3T1 | (905) 201-8133 |
| High Life Heating Air Cond 220 Royal Crest Crt, Markham L3R 9Y2 | (905) 513-0345 |
| Ideal Indoor Air Quality 24 Thatcher's Mill Way, Markham L3P 3T3 | (905) 471-1111 |
| Jaypee Air Cond & Heating Inc 400 Don Park Rd, Markham L3R 1C6 | (905) 479-1111 |
| Rigby Air Conditioning Ltd 14 Ranger Crt, Markham L3P 6B3 | (905) 472-5051 |
| K W Mechanical Svc 91 Anderson Ave #7, Markham L6E 1A5 | (905) 471-5297 |
| Kevray Appliance Svc 27 Redwood Lane, Markham L3R 3Z1 | (905) 477-8409 |
| Mti Mechanical Trade Inds 220 Royal Crest Crt, Markham L3R 9Y2 | (416) 492-4436 |
| Mti Mechanical Trade Ind Ltd 220 Royal Crest Crt, Markham L3R 9Y2 | (905) 513-1953 |
| Palmer Brothers Heating & Ac 90 Esna Park Dr, Markham L3R 2R7 | (905) 470-7563 |
| Pinewood Heating & Air Cond 250 Cochrane Dr #7, Markham L3R 8E5 | (905) 479-0542 |
| Quality Control Corp 333 Denison St #9, Markham L3R 2Z4 | (905) 479-3994 |
| Ringwood Heating & Air Cond 6 Ramona Blvd, Markham L3P 2E2 | (905) 472-6515 |
| Roteck Systems 117 William Honey Cres, Markham L3S 2M3 | (905) 472-5139 |
| Sheridan Heating 187 Ramona Blvd, Markham L3P 2K9 | (905) 471-4222 |
| Sig Mechanical Svc 51 Esna Park Dr #B, Markham L3R 1C9 | (416) 798-7757 |
| Stouffville Air Systems 7 Spring, Markham | (905) 642-4926 |
| Unionville Heating & Air Cond 4418 Highway 7, Markham L3R 1M2 | (905) 479-1290 |
| Davenport Campbell Co 151 Bentley St #1, Markham L3R 3X9 | (905) 475-0389 |
| Gaynor Mechanical Svc 172 Bullock Dr, Markham L3P 7M9 | (905) 471-6241 |