| Business | Phone |
| C & I Mechanical Svc 1483 Balhan Dr # 102, Concord 94521 | (925) 687-0221 |
| Bay Area Svc Co 2526 Lynn Ave, Concord 94520 | (925) 689-2525 |
| Breeze Heating & Air Cond Concord 94520 | (925) 687-2777 |
| Discount Heating & Air Cond 4031 Little Ln, Concord 94521 | (925) 682-1656 |
| N K Heating & Air Conditioning 5321 Forte Ln, Concord 94521 | (925) 686-0482 |
| Total Heating & Air 5036 Commercial Cir, Concord 94520 | (925) 685-2650 |
| Troy's Repair 3351 Concord Blvd, Concord 94519 | (925) 682-9531 |