| Business | Phone |
| Al's Quality Furnace & Duct San Francisco 94112 | (415) 334-3423 |
| Community Focus San Francisco 94105 | (415) 227-0616 |
| Dryer Vent Cleaning Specialist San Francisco 94112 | (415) 333-5509 |
| Indoor Environmental Engnrng 1448 Pine St # 103, San Francisco 94109 | (415) 567-7700 |