| Business | Phone |
| Abc Cooling & Heating Svc 31845 Hayman St, Hayward 94544 | (510) 471-8181 |
| Air-Duct Manufacturer 30956 San Clemente St, Hayward 94544 | (510) 487-0200 |
| Bay Area Mechanical Inc 1273 Industrial Pkwy W # 100, Hayward 94544 | (510) 889-1745 |
| Bay Valley Heating & Air Cond 29229 Pacific St, Hayward 94544 | (925) 937-7707 |
| Control Mechanical Co 20993 Foothill Blvd # 410, Hayward 94541 | (510) 538-3364 |
| Four Seasons Heating & Ac 2215 National Ave, Hayward 94545 | (510) 886-3112 |
| I L Mechanical 28306 Industrial Blvd, Hayward 94545 | (510) 264-1298 |
| International Appliance Svc Hayward 94541 | (510) 471-0220 |
| Knoll Systems Corp Hayward 94541 | (510) 581-1313 |
| Lukas Heating & Air Cond 25352 Cypress Ave # 1, Hayward 94544 | (510) 785-0644 |
| M & W Heating & Air Cond 2074 American Ave, Hayward 94545 | (510) 732-9884 |
| Mesa Energy Systems Inc 24051 Amador St, Hayward 94544 | (925) 485-6180 |
| Miller & Sons Air Conditioning 22555 Northview Dr, Hayward 94541 | (510) 728-0378 |
| Geary Pacific Supply 31050 Huntwood Ave, Hayward 94544 | (510) 441-1913 |
| Genesis Heating & Air Cond Hayward 94541 | (510) 881-1530 |
| True Heating & Air Cond Hayward 94541 | (510) 728-0880 |
| Cal Air Conditioning Svc 3526 Breakwater Ct, Hayward 94545 | (650) 571-5259 |