| A B T Plumbing & Drain Service INC | Andrew Bennett Twidwell | — | (530) 272 9120 | HVAC | Bowman · Placer County | — | — |
| AC Group - Air Duct & Dryer Vent Incorporated | William Christian Johnson | — | (916) 664 6774 | HVAC | Roseville · Placer County | — | — |
| Accu Air | Herbert Louis Hauke | sales@accuair.com | (916) 783 8771 | HVAC | Roseville · Placer County | — | — |
| Aero Mechanics Inc. | Doru Calin Alexa | — | (916) 216 1371 | HVAC | Roseville · Placer County | — | — |
| Air Control & Design INC | Oleg German | — | (916) 628 3352 | HVAC | Loomis · Placer County | — | — |
| Air Management INC | Makhmour Arash | — | (916) 300 8139 | HVAC | Roseville · Placer County | — | — |
| Air Works INC DBA Summit Airworks | Christopher Eugene Fuselier | — | (916) 626 6303 | HVAC | Rocklin · Placer County | — | — |
| All 1 Mechanical | Jon Christian Houde | — | (916) 345 3743 | HVAC | Roseville · Placer County | — | — |
| All Seasons Heating & Air Conditioning Services | Lance Joseph Sarnecki | — | (530) 878 8340 | HVAC | Meadow Vista · Placer County | — | — |
| Allright Enterprises INC DBA Rick's Refrigeration | Richard Girard Shopek | — | (916) 201 0808 | HVAC | Granite Bay · Placer County | — | — |
| Almas Heating & Air | Almas Heating & Air | — | (916) 826 7038 | HVAC | Roseville · Placer County | — | — |
| Aloha Heating And Cooling | Debra Ann| Stephens Debbie Ann Stephens | — | (530) 823 0363 | HVAC | Meadow Vista · Placer County | — | — |
| Alpine Air Co | Phillis Lee Ivory | — | (916) 791 0425 | HVAC | Granite Bay · Placer County | — | — |
| Amac HVAC INC | Anthony Thomas Macreadie | — | (916) 470 0347 | HVAC | Roseville · Placer County | — | — |
| American Comfort Heating & Air LLC | Kristopher Conrad Smith | — | (916) 367 8672 | HVAC | Lincoln · Placer County | — | — |
| American Energy Home Pro's | Matthew Lee Mcguire | — | (916) 520 9990 | HVAC | Loomis · Placer County | — | — |
| American Heating And Cooling | American Heating And Cooling | — | (916) 759 2802 | HVAC | Penryn · Placer County | — | — |
| American Refrigeration & Air Conditioning | American Refrigeration & Air Conditioning | — | (775) 388 0177 | HVAC | Roseville · Placer County | — | — |
| American Services Industries INC | Dennis Fay Graham | — | (916) 672 6789 | HVAC | Rocklin · Placer County | — | — |
| Apsi | James Jay Iv Hanacek | — | (530) 537 2949 | HVAC | Auburn · Placer County | — | — |
| Arc Heating And Air Conditioning | Vitaliy Vasilyevich Ivanov | — | (916) 540 0123 | HVAC | Roseville · Placer County | — | — |
| Astro Air Design INC | Dana Rae White | — | (916) 645 0882 | HVAC | Lincoln · Placer County | — | — |
| Auburn Family Construction | Steven Gerard Rowett | — | (530) 303-2574 | HVAC | Auburn · Placer County | — | — |
| Austin Sheet Metal Works INC DBA Austin Heat & Air | Kerry Ann Austin | — | (916) 624 1749 | HVAC | Rocklin · Placer County | — | — |
| Automated Control INC | Ruben Efren Jr Rubio | — | (800) 850 4270 | HVAC | Lincoln · Placer County | — | — |
| B C Commercial Refrigeration | B C Commercial Refrigeration | — | (530) 582 8047 | HVAC | Tahoe Vista · Placer County | — | — |
| Baker Air Repair | Baker Air Repair | — | (916) 521 1185 | HVAC | Newcastle · Placer County | — | — |
| Belle Air Systems | Belle Air Systems | eric@belleairsystems.com | (916) 521 3144 | HVAC | Roseville · Placer County | — | — |
| Birdi HVAC | Birdi HVAC | — | (916) 953 9079 | HVAC | Roseville · Placer County | — | — |
| Blaze Air | Blaze Air | — | (530) 906 8807 | HVAC | Auburn · Placer County | — | — |
| Bluewater Air Conditioning & Electrical | Andre Chapman Ballowe | — | (415) 730 0770 | HVAC | Colfax · Placer County | — | — |
| Bolt Mechanical | Bolt Mechanical | — | (530) 346 6863 | HVAC | Colfax · Placer County | — | — |
| Bronco Plumbing Heating And Air | Phillip James Olmstead | — | (916) 675 1062 | HVAC | Roseville · Placer County | — | — |
| Brower Mechanical Ca LLC | Eric Lyle Beardemphl | — | (916) 624 0808 | HVAC | Rocklin · Placer County | — | — |
| Brown Mechanical | Brown Mechanical | info@brown-mechanical.ca | (916) 698 5620 | HVAC | Meadow Vista · Placer County | — | — |
| Built Right Mechanical INC | Anthony Orlando Indrieri | service@builtrightmechanical.com | (916) 606 6788 | HVAC | Lincoln · Placer County | — | — |
| C & E Enterprises | Erik Donovan Butrick | — | (916) 765 9925 | HVAC | Granite Bay · Placer County | — | — |
| Cal Pro Builders Company INC | Konstantin Victorvich Zhirkov | info@calprobuilders.com | (916) 628 1245 | HVAC | Roseville · Placer County | — | — |
| Cali Air | Cali Air | — | (916) 622 0907 | HVAC | Lincoln · Placer County | — | — |
| California Air Comfort | California Air Comfort | — | (530) 415 3114 | HVAC | Rocklin · Placer County | — | — |