| Business | Phone |
| Air Conditioning Svc 38 Blue Ridge Cres, London N6K 2X1 | (519) 438-7084 |
| Air-Tech Systems Ltd 3392 Wonderland Rd S #3, London N6L 1A8 | (519) 652-6401 |
| Ambient Systems 4058 Eastgate Cres, London N6L 1B2 | (519) 652-3281 |
| Aok Heating & Cooling Inc 1 Croatia Rd, London N5V 4X6 | (519) 457-0671 |
| Apex Enviro Systems 4474 Blakie Rd #134, London N6L 1G7 | (519) 652-6200 |
| Applied Associates 875 Adelaide St N, London N5Y 2M2 | (519) 439-1243 |
| Harris Mechanical 960 Elias St, London N5W 3P4 | (519) 673-0558 |
| Homes Mechanical 38 Redwood Lane, London N5V 4C4 | (519) 452-4803 |
| J & A Schwartz Ltd 190 Rectory St, London N5Z 2A5 | (519) 432-8851 |
| Ken Martin Mechanical Svc 84 Wharncliffe Rd S, London N6J 2K1 | (519) 439-7589 |
| Kilner Southwestern Inc 3 Kinnear Cres, London N6K 1V7 | (519) 641-4300 |
| Lewis Furnace & Sheet Metal Po Box 33037 Rpo Oxbury, London N5Y 5L4 | (519) 631-4130 |
| Marks & Co Ltd 1050 Elias St, London N5W 3P6 | (519) 659-4666 |
| Mc Cleave Mechanical 1335 Hamilton Rd, London N5W 1B1 | (519) 659-2214 |
| Metropolitan Heating & Ac 31 Biscay Rd, London N6H 3K8 | (519) 472-7490 |
| New Air Svc 2675 Gideon Dr, London | (519) 646-4082 |
| Orchard A-1 Stop Shop Heating 2074 River Rd, London N5W 6C2 | (519) 452-1650 |
| Poulsen Heating & Air Cond 609 Clarke Rd #10, London N5V 2E1 | (519) 455-7330 |
| Pro-Tech Mechanical Svc Ltd 685 Hamilton Rd, London N5Z 1T4 | (519) 452-1631 |
| Ron Johnson Same Day Svc 99 Edgevalley Rd, London | (519) 452-3975 |
| Best Services Heating & Air 320 Calgary St, London N5W 4X4 | (519) 455-5846 |
| Blake Mechanical Svc Inc 960 Elias St #4, London N5W 3P4 | (519) 673-0555 |
| Royal Air Cond & Htg Ltd 480 Huntingdon Dr, London N6C 4J1 | (519) 681-9561 |
| Roy Inch & Sons Ltd 878 Wellington Rd, London N6E 1L9 | (519) 681-2450 |
| Select Air Temp 295 Bloxam Ave, London N6J 3K5 | (519) 471-3995 |
| Trane Canada 8 Belleisle Crt, London N5V 4L2 | (519) 453-3010 |
| Union Energy 360 Exeter Rd, London N6E 2Z4 | (519) 686-7554 |
| Canada Cooling 511 St James St, London N5Y 3P4 | (519) 432-0800 |
| Carmichael Engineering Ltd 4093 Meadowbrook Dr #103, London N6L 1G1 | (519) 652-7667 |
| Carver Sheet Metal Inc 954 Leathorne St #8, London N5Z 3M5 | (519) 686-1545 |
| Central Heating & Cooling 418 Rectory St, London N5W 3W4 | (519) 439-9633 |
| Climate Control 41 Adelaide St N, London N6B 3P4 | (519) 439-1300 |
| Concept Cooling 511 St James St, London N5Y 3P4 | (519) 646-1518 |
| Consolidated Systems 580 Quebec St, London N5W 3Z2 | (519) 439-0580 |
| Crawford Air Ltd 199 Exeter Rd #C, London N6L 1A4 | (519) 652-9299 |
| Day Energy Management 782 Barclay Rd, London N6K 1K8 | (519) 473-3190 |
| Discount Heating & Cooling 88 Fairchild Cres, London N6E 3E5 | (519) 686-7330 |
| Forest City Gas 928 Springbank Dr, London N6K 1A5 | (519) 474-1117 |
| Fortress Group 1050 Hargrieve Rd, London N6E 1P5 | (519) 685-5554 |