| Business | Phone |
| Heat-Cool Depot 53 Riverside Dr S, Oshawa L1H 6P1 | (905) 725-5559 |
| Hi-Tech Heating & Cooling 501 Phillip Murray Ave, Oshawa L1J 1H7 | (905) 579-5257 |
| Ramnor Heating & Air Cond 1621 Mcewen Dr, Oshawa | (905) 725-2700 |
| Pump Works 221 Celina St, Oshawa L1H 4N7 | (905) 579-2864 |
| Sieg's Heating & Sheet Metal 381 Mitchell Ave, Oshawa L1H 2W3 | (905) 725-2820 |
| Tennant's Heating 293 Ridgeway Ave, Oshawa L1J 2T9 | (905) 436-0716 |
| Trans Air Mechanical 808 Phillip Murray Ave, Oshawa L1J 1J4 | (905) 434-8132 |
| Wagler Heating & Air Cond 605 Pondtail Crt, Oshawa L1K 2C7 | (905) 576-8311 |
| Country Comfort Heating & Ac 127 Warren Ave, Oshawa L1J 4G5 | (905) 697-0621 |
| Dr Comfort 440 King St E, Oshawa L1H 1E6 | (905) 571-4178 |
| Frank Reher Air Conditioning 809 Grandview Dr, Oshawa L1H 7W5 | (905) 728-5097 |
| G M Mechanical 914 Grandview St N, Oshawa L1K 2E3 | (905) 436-3974 |