| A & R Heating & Air Conditioning INC | Bradley Allen Reeder | — | (530) 246 9777 | HVAC | Redding · Shasta County | — | — |
| A & S Heating And Air | Ian Edward Allen | — | (530) 567 9720 | HVAC | Anderson · Shasta County | — | — |
| Absolute Comfort Heating And Air Conditioning INC | Clyde Dean Haltom | — | (530) 241 7703 | HVAC | Redding · Shasta County | — | — |
| Air - O - Service | Jack Albert Jr Sanders | customerservice@airoservice.com | (530) 221 4691 | HVAC | Redding · Shasta County | — | — |
| Air Care Heating And Air Conditioning | Michael James Williams | — | (530) 941 9576 | HVAC | Cottonwood · Shasta County | — | — |
| Air Experts | Air Experts | — | (530) 241 0815 | HVAC | Anderson · Shasta County | — | — |
| Air Pro Heating & Air Conditioning | Michael Edward Kranz | — | (530) 524 2226 | HVAC | Shasta Lake · Shasta County | — | — |
| Air-o Service | Daniel Carver Sr Hoeppner | customerservice@airoservice.com | (530) 221 4691 | HVAC | Redding · Shasta County | — | — |
| Aireco Heating & Cooling | Aireco Heating & Cooling | — | (530) 510 7362 | HVAC | Millville · Shasta County | — | — |
| Airflow Dynamics LLC | Justin Charles Nelson | — | (530) 355 1242 | HVAC | Shasta Lake · Shasta County | — | — |
| All About Air | All About Air | — | (530) 364 8434 | HVAC | Anderson · Shasta County | — | — |
| Allenair Heating And Cooling | Allenair Heating And Cooling | — | (530) 808 5798 | HVAC | Redding · Shasta County | — | — |
| Allianz Heating & Air INC | Royal Decker Hawkley | — | (530) 221 2642 | HVAC | Redding · Shasta County | — | — |
| Anderson Heating And Cooling | Mark Eugene Dulong | — | (530) 365 3600 | HVAC | Anderson · Shasta County | — | — |
| Apex Heating And Air Conditioning INC | Jesse Scott Duval | — | (530) 355 1524 | HVAC | Redding · Shasta County | — | — |
| Asap Redding Heating & Cooling | Asap Redding Heating & Cooling | — | (530) 440 1955 | HVAC | Redding · Shasta County | — | — |
| Bob Moon Heating And Air Incorporated | Robert Donald Moon | — | (530) 949 7935 | HVAC | Redding · Shasta County | — | — |
| Brown Plumbing | Brown Plumbing | — | (530) 244 7473 | HVAC | Redding · Shasta County | — | — |
| Cascade Comfort Service INC | Richard Edwin Boudro | — | (530) 222 4660 | HVAC | Anderson · Shasta County | — | — |
| Chandler's Quality Construction | Joseph Earl Chandler | — | (530) 227 0571 | HVAC | Cottonwood · Shasta County | — | — |
| Circle N Heating & Air Conditioning | Kevin Andrew Lundberg | — | (530) 221 6394 | HVAC | Redding · Shasta County | — | — |
| Clark Refrigeration | Clark Refrigeration | — | (530) 222 3530 | HVAC | Redding · Shasta County | — | — |
| Climatech Electric | Michael Lee Clinite | — | (530) 806 3327 | HVAC | Redding · Shasta County | — | — |
| Corbett's Heating & Air Conditioning | Corbett's Heating & Air Conditioning | — | (530) 602 2617 | HVAC | Redding · Shasta County | — | — |
| Corcoran HVAC Services | Kieran Phillip Corcoran | — | (707) 671 3021 | HVAC | Redding · Shasta County | — | — |
| Cousin Vinnie's Heating & Air | Vincent Frank Bruccheri | — | (530) 604 7939 | HVAC | Redding · Shasta County | — | — |
| Dennis' Heating & Air Conditioning INC | Jeffrey Lee Penrod | — | (530) 244 3734 | HVAC | Redding · Shasta County | — | — |
| Don Hays Heating & Air Conditioning | Donald Lee Hays | — | (530) 410 4051 | HVAC | Redding · Shasta County | — | — |
| Ducts Ina Row | Whitnee Ryan Chandler | nick@ductsinarow.com | (530) 221 2600 | HVAC | Redding · Shasta County | — | — |
| E M & Son's | Emory B Aldrich | — | (530) 222 5733 | HVAC | Redding · Shasta County | — | — |
| Egan Air Conditioning & Heating INC | Stefan Gordon Egan | — | (530) 227 8958 | HVAC | Cottonwood · Shasta County | — | — |
| Element Heating & Cooling | Element Heating & Cooling | — | (530) 604 4466 | HVAC | Shasta Lake · Shasta County | — | — |
| Elevate HVAC | Elevate HVAC | — | (530) 355 6845 | HVAC | Redding · Shasta County | — | — |
| Enterprise Heating & Air Conditioning INC | Bret Thomas Franklin | — | (530) 221 4363 | HVAC | Redding · Shasta County | — | — |
| Essex Solar Heating And Air INC | Joshua Michael Knourek | — | (530) 244 0993 | HVAC | Redding · Shasta County | — | — |
| Fall River Heating & Air | Fall River Heating & Air | — | (530) 276 5926 | HVAC | Fall River Mills · Shasta County | — | — |
| Gard Heating & Air INC | Kevin Edward Gard | — | (530) 221 7494 | HVAC | Redding · Shasta County | — | — |
| Gibson Heating And Air Conditioning | Lynnea Dorine Gibson | — | (530) 242 2000 | HVAC | Redding · Shasta County | — | — |
| Golden State Comfort | Golden State Comfort | — | (530) 917 0660 | HVAC | Redding · Shasta County | — | — |
| High Efficiency Solutions INC DBA Timberline Heating & Air Condit | Whitnee Ryan Chandler | — | (530) 221 2222 | HVAC | Redding · Shasta County | — | — |