| Business | Phone |
| Aire Masters Air Conditioning 2450 Evergreen Springs Dr, Diamond Bar 91765 | (909) 595-3172 |
| Fenco Diamond Bar 91765 | (909) 861-5096 |
| Walnut Air Conditioning & Htg 1249 S Diamond Bar Blvd # 150, Diamond Bar 91765 | (909) 595-3363 |
| J A Lopez Air Cond & Heating Diamond Bar 91765 | (909) 860-6086 |
| Service Wizards 516 N Diamond Bar Blvd # 234, Diamond Bar 91765 | (909) 627-1021 |
| Mike's Heating & Air Cond 22839 Dry Creek Rd, Diamond Bar 91765 | (909) 396-4489 |
| Mac Refrigeration & Air Cond 23727 Silver Spray Dr, Diamond Bar 91765 | (909) 861-7600 |