| Business | Phone |
| Absolute Refrigeration 60 Fisher Cres, Hamilton L9C 4N2 | (905) 574-3388 |
| Able Heating Cooling & Refrig 52 Sherry Lane Dr, Hamilton L8K 5R3 | (905) 578-7040 |
| A Universal Hvac Systems 1500 Upper James St #1, Hamilton L9B 1K3 | (905) 637-0102 |
| Aire One West Inc 970 Upper James St, Hamilton L9C 3A5 | (905) 385-9366 |
| Airways Heating & Cooling 6330 Sinclairville, Hamilton | (905) 692-0607 |
| Airco Air Conditioning Heating 55 Unsworth Dr #3, Hamilton L8W 2T7 | (905) 389-8338 |
| Aspen Air Systems 60 Lancing Dr, Hamilton L8W 3A1 | (905) 318-1103 |
| Ancaster Mechanical Ltd 53 Stone Church Rd W, Hamilton L9B 1A1 | (905) 304-1055 |
| Angelo's Heating & Air Cond 321 Anchor Rd #4, Hamilton L8W 3R1 | (905) 575-1446 |
| Arctic Refrigeration 78 Catharine St N, Hamilton L8R 1J2 | (905) 528-8528 |
| Ashland Heating & Air Cond Inc 175 Nebo Rd #5, Hamilton L8W 2E1 | (905) 575-8202 |
| H & L Refrigeration & Air Cond 32 Sawyer Rd, Hamilton L8L 3R8 | (905) 529-6008 |
| Hamco Heating & Cooling Ltd 200 Queen St N, Hamilton L8R 2W3 | (905) 527-1049 |
| Honeywell 2511 Barton St E, Hamilton L8E 2X1 | (905) 573-4500 |
| Langton Mechanical 245 Coronation Ave, Hamilton L8K 1Z4 | (905) 312-9644 |
| Napoleon Home Comfort Hamilton 720 Upper James St #1, Hamilton L9C 2Z9 | (905) 383-3983 |
| Philip Doyle Mfg Inc 79 Covington St, Hamilton L8E 2Y4 | (905) 561-0545 |
| Plunkett Heating & Air Cond 20 Warrington St, Hamilton L8E 3V1 | (905) 573-8755 |
| Post Controlled Air Inc 45 Lancing Dr #5, Hamilton L8W 2Z9 | (905) 578-1942 |
| Beston Air Systems 2 Landron Ave, Hamilton L8T 4Y5 | (905) 318-9299 |
| Service Air Conditioning-Heat 30 Bolan Crt, Hamilton L8V 1S7 | (905) 387-5804 |
| Trane Hamilton 627 Main St E #201, Hamilton L8M 1J5 | (905) 308-7780 |
| Union Energy 70 Hempstead Dr #C, Hamilton L8W 2E7 | (905) 575-1085 |
| Universal Heating Air Cond 1508 Upper James St, Hamilton L9B 1K3 | (905) 387-6433 |
| Britannia Refrigeration 215 Kenilworth Ave N, Hamilton L8H 4S3 | (905) 545-0054 |
| Clare Moore Refrigeration 601 Burlington St E, Hamilton L8L 4J5 | (905) 522-7141 |
| Detail Heating & Air Cond 15 Lyndhurst St, Hamilton L8L 7G6 | (905) 547-3174 |
| Fortress Group Inc 110 Lancing Dr, Hamilton L8W 3A1 | (905) 574-6825 |
| G & P Electric Appliance Svc 79 Ottawa, Hamilton | (905) 549-5335 |