| Business | Phone |
| All Heating & Sheet Metal Inc 2324 American Ave, Hayward 94545 | (510) 782-9811 |
| Control Air North Inc 20957 Cabot Blvd, Hayward 94545 | (510) 887-1800 |
| Environmental Comfort Systems 28310 Industrial Blvd, Hayward 94545 | (510) 732-6254 |
| Marelich Mechanical Co 24041 Amador St, Hayward 94544 | (510) 785-5500 |
| Russ Will Mechanical 20684 Corsair Blvd, Hayward 94545 | (510) 887-6610 |
| Serge's Heating & Air Cond 25613 Dollar St, Hayward 94544 | (510) 733-5585 |