| Aaron Christensen DBA Arrowhead Heating & Cooling | Arrowhead Heating & Cooling | — | (707) 295 2276 | HVAC | Middletown · Lake County | — | — |
| Abbotts Heating & Air Conditioning | Abbotts Heating & Air Conditioning | — | (707) 263 5722 | HVAC | Lakeport · Lake County | — | — |
| Barnell Heating And A C | Barnell Heating And A C | — | (707) 328 8498 | HVAC | Kelseyville · Lake County | — | — |
| Comfortable Living HVAC | Comfortable Living HVAC | — | (707) 367 0946 | HVAC | Lower Lake · Lake County | — | — |
| Cool Air Conditioning & Heating INC | Michael James Huber | — | (707) 245 7332 | HVAC | Kelseyville · Lake County | — | — |
| Fahrenheit Heating And Air Conditioning | Fahrenheit Heating And Air Conditioning | — | (707) 295 0399 | HVAC | Clearlake · Lake County | — | — |
| Gsw Heating And Air | Gsw Heating And Air | — | (408) 665 0939 | HVAC | Nice · Lake County | — | — |
| Harmony Air INC | Shempliner Alexander | — | (707) 239 9288 | HVAC | Kelseyville · Lake County | — | — |
| Hedge Refrigeration Service | David Samuel Hedge | — | (707) 809 7424 | HVAC | Hidden Valley Lake · Lake County | — | — |
| Henry Repairs HVAC INC | Charles Allen Tanti | — | (707) 263 6598 | HVAC | Lakeport · Lake County | — | — |
| Jaco Heating Air Conditioning & Refrigeration | John Sy Armas | — | (707) 263 3402 | HVAC | Lakeport · Lake County | — | — |
| John M Hagan | John M Hagan | — | (707) 263 1151 | HVAC | Lakeport · Lake County | — | — |
| Jonas Energy Solutions | Edward Allan Kronk | — | (707) 994 5911 | HVAC | Lower Lake · Lake County | — | — |
| Lake HVAC | Lake HVAC | — | (781) 438-8814 | HVAC | Lake · Lake County | — | — |
| M & M Refrigeration | M & M Refrigeration | — | (707) 816 9063 | HVAC | Cobb · Lake County | — | — |
| Milne Mechanical Corporation | Justin Eddie Milne | — | (707) 812 3738 | HVAC | Middletown · Lake County | — | — |
| Mission Viejo Heating & Air | Mission Viejo Heating & Air | — | (949) 540-8142 | HVAC | Lake Forest · Lake County | — | — |
| Pierson Mechanical | Pierson Mechanical | — | (707) 272 2511 | HVAC | Lakeport · Lake County | — | — |
| Pullman Heating & Cooling INC | Jacob Sterling Pullman | — | (707) 355 0124 | HVAC | Middletown · Lake County | — | — |
| Real Plumbing And Heating INC | Peter Mack Ambrosia | — | (415) 282 5599 | HVAC | Clearlake Oaks · Lake County | — | — |
| Refrigeration Technology Incorporated | C Glen Marks | — | (707) 987 0500 | HVAC | Middletown · Lake County | — | — |
| Right On Time Heating And Cooling | Justin Gregory Mccarty | rightontimehvac@gmail.com | (707) 367 1194 | HVAC | Clearlake · Lake County | — | — |
| Running Springs Heating & Air | Running Springs Heating & Air | — | (707) 263 4938 | HVAC | Lakeport · Lake County | — | — |