| 707 Plumbers INC DBA 707 Electric | Matthew Scott Duncan | — | (707) 292 2262 | HVAC | Santa Rosa · Sonoma County | — | — |
| Aaa Energy Systems INC | Laurel Jean Lewis | info@aaaenergysystems.com | (707) 585 8670 | HVAC | Santa Rosa · Sonoma County | — | — |
| Absolute Comfort Heating & Air Conditioning | Kevin Christopher Fenk | — | (707) 585 3555 | HVAC | Rohnert Park · Sonoma County | — | — |
| Absolute Mechanical | Absolute Mechanical | — | (707) 478 7861 | HVAC | Santa Rosa · Sonoma County | — | — |
| Acrat Plumbing & Heating LLC | David Lee Tarca | — | (707) 322 6095 | HVAC | Petaluma · Sonoma County | — | — |
| Action Plumbing And Heating Maintenance | Action Plumbing And Heating Maintenance | — | (707) 584 0714 | HVAC | Santa Rosa · Sonoma County | — | — |
| Acz Mechanical INC | Zachary James Brown | — | (707) 543 6271 | HVAC | Forestville · Sonoma County | — | — |
| Adams Refrigeration Service INC A California Corporation | Brian Thomas Adams | — | (707) 795 6059 | HVAC | Petaluma · Sonoma County | — | — |
| Affordable Heating & Air Conditioning | Affordable Heating & Air Conditioning | — | (707) 953 3345 | HVAC | Santa Rosa · Sonoma County | — | — |
| Air Connection | Mark Samuale Morelli | — | (707) 571 8384 | HVAC | Santa Rosa · Sonoma County | — | — |
| Air Doctor | Laurel Ann Mccarthy | — | (707) 584 5941 | HVAC | Rohnert Park · Sonoma County | — | — |
| Air Systems Innovations INC | Emilio Jose Morales | — | (707) 888 6460 | HVAC | Santa Rosa · Sonoma County | — | — |
| Air Works_mechancial Services | Wesley Earl Stetenfeld | — | (707) 807 3121 | HVAC | Santa Rosa · Sonoma County | — | — |
| Albaugh Heating And Air - Conditioning | David Lowell Albaugh | — | (707) 871 3530 | HVAC | Santa Rosa · Sonoma County | — | — |
| Altamirano Appliance Refrigeration INC | Ramiro Eulises Altamirano Gopar | — | (707) 623 5164 | HVAC | Rohnert Park · Sonoma County | — | — |
| American Builders | American Builders | — | (415) 559 6759 | HVAC | Sonoma · Sonoma County | — | — |
| American Heating & Air LLC | Anguiano Ricardo Mora | — | (707) 807 4822 | HVAC | Santa Rosa · Sonoma County | — | — |
| American Radiant & Water Heating INC | Brendan Keith Dunbar | — | (707) 331 2199 | HVAC | Windsor · Sonoma County | — | — |
| Anthony Joseph Adiego | Anthony Joseph Adiego | — | (707) 975 4083 | HVAC | Petaluma · Sonoma County | — | — |
| Apex Heating & Air | Apex Heating & Air | — | (707) 477 8647 | HVAC | Windsor · Sonoma County | — | — |
| Artemio Diaz | Artemio Diaz | — | (707) 477 7302 | HVAC | Guerneville · Sonoma County | — | — |
| Atmosair Heating And Air Conditioning | Atmosair Heating And Air Conditioning | — | (707) 322 6564 | HVAC | Sebastopol · Sonoma County | — | — |
| Atmosphere Heating And Air Conditioning | Atmosphere Heating And Air Conditioning | — | (707) 547 7594 | HVAC | Santa Rosa · Sonoma County | — | — |
| Baier Heating And Air Conditioning INC | Chad William Baier | — | (707) 890 5330 | HVAC | Rohnert Park · Sonoma County | — | — |
| Bay Area Mechanical And Engineering INC | Jack Berzin | — | (707) 540 5983 | HVAC | Penngrove · Sonoma County | — | — |
| Best Chance Heating And Cooling | Chance Melzar Rosado | — | (707) 900 8381 | HVAC | Santa Rosa · Sonoma County | — | — |
| Bianchi Mechanical | Bianchi Mechanical | — | (707) 848 1577 | HVAC | Santa Rosa · Sonoma County | — | — |
| Big Al's Heating & Air LLC | Vijay Eknath Ambavanekar | — | (805) 427 6021 | HVAC | Santa Rosa Valley · Sonoma County | — | — |
| Bigham Home Services | Paul William Bigham | — | (707) 975 9588 | HVAC | Windsor · Sonoma County | — | — |
| Bill Kutz Heating & Air Conditioning INC | William Robert Kutz | — | (707) 623 9814 | HVAC | Santa Rosa · Sonoma County | — | — |
| Bkb Heating Air Conditioning & Sheet Metal | Brian Keith Butts | — | (707) 769 9655 | HVAC | Petaluma · Sonoma County | — | — |
| Black Sun Boilers INC | Christopher John Doble | chris@blacksunboilers.com | (415) 310 7540 | HVAC | Santa Rosa · Sonoma County | — | — |
| Blaze Heating & Air Conditioning | Blaze Heating & Air Conditioning | — | (707) 396 7835 | HVAC | Santa Rosa · Sonoma County | — | — |
| Blue Collar Comfort INC | Rick Anthony Cordova | — | (707) 483 2883 | HVAC | Santa Rosa · Sonoma County | — | — |
| Blue Oak Heating & Cooling INC | Somchit Khoupradit | — | (707) 582 1166 | HVAC | Santa Rosa · Sonoma County | — | — |
| Bob Etchell Plumbing & Heating | Bob Etchell Plumbing & Heating | — | (707) 888 2884 | HVAC | Healdsburg · Sonoma County | — | — |
| Boden Plumbing INC | Terrence Joseph Boden | info@bodenplumbing.com | (707) 996 8683 | HVAC | Sonoma · Sonoma County | — | — |
| Bonney INC DBA Heatwave Systems | Joseph Anthony Boney | — | (707) 939 8482 | HVAC | Sonoma · Sonoma County | — | — |
| Bozarth Plumbing Co | Brian Roy Bozarth | — | (650) 333 5408 | HVAC | Santa Rosa · Sonoma County | — | — |
| Bragg Home Services | Rickie Kenneth Chandler | — | (707) 939 6165 | HVAC | Santa Rosa · Sonoma County | — | — |