| Business | Phone |
| Air Spec Corp 600 E Walnut Ave, Fullerton 92831 | (714) 879-8151 |
| Albert Air Conditioning & Htg 2021 W Commonwealth Ave # L, Fullerton 92833 | (714) 526-6368 |
| A Acacia Air Cond & Heating 1419 W Baker Ave, Fullerton 92833 | (714) 870-0590 |
| A H & H Air Cond Htg & Refrig 1419 W Baker Ave, Fullerton 92833 | (714) 525-0541 |
| Acms 1519 E Chapman Ave # 349, Fullerton 92831 | (714) 870-7047 |
| Air Cooler Co Fullerton 92833 | (323) 733-6167 |
| Air Supply Heating & Air Cond 2148 W Maxzim Ave, Fullerton 92833 | (714) 773-5865 |
| American Air Heating & Ac 321 N Sweet Ave, Fullerton 92833 | (714) 738-3082 |
| Andrew's Air 828 E Walnut Ave, Fullerton 92831 | (714) 526-6510 |
| Bauserman Air Conditioning 808 W Commonwealth Ave, Fullerton 92832 | (714) 526-3326 |