| A Climate Control | A Climate Control | — | (707) 816 1776 | HVAC | Vacaville · Solano County | — | — |
| A-1 Comfort Heating & Air | A-1 Comfort Heating & Air | — | (707) 301 0717 | HVAC | Fairfield · Solano County | — | — |
| A-1 Guaranteed Heating & Air Conditioning INC | Richard William Hiteshew | — | (707) 645 0734 | HVAC | Vallejo · Solano County | — | — |
| A100 Percent Guarantee Heating And A/c | Evan Tyler Thompson | — | (707) 689 5128 | HVAC | Vacaville · Solano County | — | — |
| Advanced Solutions & Services INC DBA Advanced Plumbing Heating | Danielle Nicole Fontaine | — | (707) 446 1800 | HVAC | Vacaville · Solano County | — | — |
| Air Essentials INC | Anthony Edward Pirrung | — | (707) 446 4080 | HVAC | Vacaville · Solano County | — | — |
| Air Tech Heating & Air Conditioning | Richard Wayne Jr Laughridge | — | (707) 330 7214 | HVAC | Vacaville · Solano County | — | — |
| Airelio HVAC Services INC | Aurelio Gernale Fabro | — | (707) 392 6761 | HVAC | Vacaville · Solano County | — | — |
| Aleco Electric INC | Peter James Alsbury | — | (800) 573 8803 | HVAC | Vacaville · Solano County | — | — |
| All Star A/c & Heating Ngov | Henry Hai Ngov | — | (707) 384 2775 | HVAC | Fairfield · Solano County | — | — |
| All Trades & Design INC DBA J F Mechanical 3:23 | James Harl Fitchhorn | — | (707) 372 8748 | HVAC | Vacaville · Solano County | — | — |
| All Weather Heating & Air Conditioning INC | Gilbert Richard Jr Medrano | — | (707) 447 9855 | HVAC | Vacaville · Solano County | — | — |
| American Air Systems INC | Dana Lynn Rush | — | (650) 339 9354 | HVAC | Vacaville · Solano County | — | — |
| Amigos Heating And Air | Amigos Heating And Air | — | (707) 427 2785 | HVAC | Fairfield · Solano County | — | — |
| Andre's Air | Andre's Air | — | (707) 386 2313 | HVAC | Vacaville · Solano County | — | — |
| Austin's Air Conditioning And Heating INC | David Castillo Mendoza | — | (707) 422 2593 | HVAC | Vacaville · Solano County | — | — |
| Avalon Construction & Facility Services INC | Luis Alfredo Perez | — | (510) 488 8081 | HVAC | Vacaville · Solano County | — | — |
| Bay Quality Comfort | Bay Quality Comfort | bayqualitycomfort@icloud.com | (925) 915 5354 | HVAC | Benicia · Solano County | — | — |
| Benicia Plumbing INC | Heidi Anna Bucher | — | (707) 745 2930 | HVAC | Benicia · Solano County | — | — |
| Blue Mountain Construction Services INC | Stephanie Michele Maclean | — | (707) 451 8111 | HVAC | Vacaville · Solano County | — | — |
| Blue Pacific Heating & Air | Blue Pacific Heating & Air | — | (707) 280 4978 | HVAC | Vacaville · Solano County | — | — |
| Bluesky Heating And Air | Matthew Garrett Vallis | — | (510) 375 7839 | HVAC | Fairfield · Solano County | — | — |
| Bobbie Knowles Plumbing | Bobbie Knowles Plumbing | — | (510) 307 6603 | HVAC | Vallejo · Solano County | — | — |
| Brambila Heating & Air Conditioning | Brambila Heating & Air Conditioning | — | (415) 827 6197 | HVAC | Fairfield · Solano County | — | — |
| Brother's Heating & Air INC | Christopher Allen Pixton | — | (925) 822 6946 | HVAC | Birds Landing · Solano County | — | — |
| C & D Mechanical INC | Dina Michelle Vigil | — | (707) 708 1889 | HVAC | Benicia · Solano County | — | — |
| Cag Investments INC DBA Global HVAC And Construction | Walter Clay Gardiner | — | (707) 886 8932 | HVAC | Vacaville · Solano County | — | — |
| Cal - Bay Service | Guido Christopher| Estrada Guido Jorge Estrada | calbayservicehvac@yahoo.com | (707) 746 8755 | HVAC | Benicia · Solano County | — | — |
| Camacho Mechanical | Camacho Mechanical | — | (209) 607 9807 | HVAC | Rio Vista · Solano County | — | — |
| Cardoza Mechanical | Cardoza Mechanical | — | (661) 437 1023 | HVAC | Vacaville · Solano County | — | — |
| Certified Comfort Heating & Air Conditioning Service | Steven Warren Haynes | — | (707) 446 3080 | HVAC | Vacaville · Solano County | — | — |
| Ces Integrated Corporation | Vincent John Nicholas | service@cesintegrated.com | (707) 759 6043 | HVAC | Fairfield · Solano County | — | — |
| Checkmate Mechanical LLC | Scott Thomas Nelson | — | (707) 656 3683 | HVAC | Vallejo · Solano County | — | — |
| Clean Breeze Air | Clean Breeze Air | — | (408) 202 9693 | HVAC | Fairfield · Solano County | — | — |
| Comfort Systems HVAC | Comfort Systems HVAC | — | (707) 771 5329 | HVAC | Benicia · Solano County | — | — |
| Coolrite Heating And Air | Coolrite Heating And Air | — | (707) 624 0930 | HVAC | Vacaville · Solano County | — | — |
| Cozy Home Services | Gary Jason Grant | — | (707) 474 5097 | HVAC | Vacaville · Solano County | — | — |
| Creative Comfort Systems | Creative Comfort Systems | — | (707) 643 2573 | HVAC | Vallejo · Solano County | — | — |
| Custom Valve Solutions INC | Neil Arthur Tiangsing | — | (925) 951-3234 | HVAC | Vallejo · Solano County | — | — |
| D & K Heating & Air Conditioning | David James White | — | (707) 344 0030 | HVAC | Vacaville · Solano County | — | — |