| 1 AC Guys | Sahak Danielyan | — | (213) 444 4223 | HVAC | Panorama City · Los Angeles County | — | — |
| 110 Pro HVAC INC | Messbah Dast Gheib | — | (818) 590 6886 | HVAC | Encino · Los Angeles County | — | — |
| 1st Call Refrigeration INC | Todd Anthony Garcia | — | (714) 951 6383 | HVAC | Whittier · Los Angeles County | — | — |
| 2 Elements Heating & A/c | 2 Elements Heating & A/c | — | (562) 412 3238 | HVAC | Hacienda Heights · Los Angeles County | — | — |
| 310 HVAC LLC | John Angel Castillo | — | (310) 902 0393 | HVAC | Mar Vista · Los Angeles County | — | — |
| 360 Air Conditioning | 360 Air Conditioning | — | (213) 820 2714 | HVAC | Los Angeles · Los Angeles County | — | — |
| 360 Heating & Air | 360 Heating & Air | — | (323) 636 1701 | HVAC | Los Angeles · Los Angeles County | — | — |
| 3wire Refrigeration | Intermediate Holdings Iii LLC Pt | — | (800) 576 0123 | HVAC | Compton · Los Angeles County | — | — |
| 4 Season Air | 4 Season Air | — | (818) 482 3277 | HVAC | Sylmar · Los Angeles County | — | — |
| 4 Seasons HVAC | 4 Seasons HVAC | — | (626) 205 0911 | HVAC | Monrovia · Los Angeles County | — | — |
| 5 Star Best Plumbing | Raymond Earl Jackson | — | (855) 999 4417 | HVAC | Newhall · Los Angeles County | — | — |
| 5 Star Heating & Cooling | 5 Star Heating & Cooling | — | (562) 618 3410 | HVAC | Paramount · Los Angeles County | — | — |
| 7 Two Degry's Air Cond & Heating | Torres Rodrigo Casas | — | (213) 703 7736 | HVAC | West Hills · Los Angeles County | — | — |
| 74 Degrees Heating & Air INC | Jose Luis Pineda Penaloza | — | (310) 431 4444 | HVAC | Lennox · Los Angeles County | — | — |
| 888 HVAC INC | Eli Farash | — | (310) 919 8800 | HVAC | Sherman Oaks · Los Angeles County | — | — |
| A & A Quick Cooling INC | Elbaz Yizhaq | — | (310) 273 7037 | HVAC | Los Angeles · Los Angeles County | — | — |
| A & B Malibu Plumbing Heating & Electrical | Cecile Roberts Valdivia-Mairesse | — | (310) 456 8550 | HVAC | Santa Monica · Los Angeles County | — | — |
| A & I Air Conditioning Services | Abnoos Armineh Keshish | — | (818) 468 7887 | HVAC | Sunland · Los Angeles County | — | — |
| A & M Heating & Air Conditioning | Stephen Shaun Mitchell | — | (626) 359 6637 | HVAC | Monrovia · Los Angeles County | — | — |
| A & R Telecom INC | Lisa Arico Rodriguez | — | (562) 531 1785 | HVAC | Bellflower · Los Angeles County | — | — |
| A - 1 Service Appliances INC | Amir M Mikhaiel | — | (310) 390 7870 | HVAC | Los Angeles · Los Angeles County | — | — |
| A / C Control INC | Babak Allan Firoozi | — | (310) 909 4814 | HVAC | Los Angeles · Los Angeles County | — | — |
| A 2 Z Refrigeration Company | Zoltan Szabo Sarkadi | — | (818) 400 4024 | HVAC | Woodland Hills · Los Angeles County | — | — |
| A A A Construction And Development | Duyeb Amer | — | (818) 785 5552 | HVAC | Canoga Park · Los Angeles County | — | — |
| A A A Electrical Service Group INC | Alejandro Castillo Plascencia | — | (818) 262 2482 | HVAC | Northridge · Los Angeles County | — | — |
| A A A/c & Builder | A A A/c & Builder | — | (626) 278 4521 | HVAC | San Gabriel · Los Angeles County | — | — |
| A And E Heating And Cooling INC | Levik Pogosian | — | (818) 497 1471 | HVAC | Tujunga · Los Angeles County | — | — |
| A And M Heating And Air Conditioning | Pavelich Michael | — | (818) 341 7757 | HVAC | Saugus · Los Angeles County | — | — |
| A B C Restaurant Equipment Co | Brian Kim Lien | — | (626) 442 1821 | HVAC | South El Monte · Los Angeles County | — | — |
| A B E Plumbing Heating & Air | Freda Simchoni | — | (818) 761 8599 | HVAC | North Hollywood · Los Angeles County | — | — |
| A B Plumbing & Heating INC | Andrew Varga | — | (323) 788 8413 | HVAC | West Hollywood · Los Angeles County | — | — |
| A Better Deal INC | Somchai Samanukorn | — | (818) 606 7955 | HVAC | Chatsworth · Los Angeles County | — | — |
| A C Dave Heating & Air | David John Millard | — | (661) 270 1961 | HVAC | Green Valley · Los Angeles County | — | — |
| A C E Care INC | Roohi Masoud | — | (310) 339 1324 | HVAC | Los Angeles · Los Angeles County | — | — |
| A C Kings Energy Efficient INC | Oscar Antonio Ramos Reyes | — | (818) 365 8822 | HVAC | Panorama City · Los Angeles County | — | — |
| A C M D | A C M D | — | (818) 200 8858 | HVAC | Granada Hills · Los Angeles County | — | — |
| A C Power Electric | Jorge Antonio Osorio | — | (562) 457 7006 | HVAC | Maywood · Los Angeles County | — | — |
| A Cool Services INC | Ronen Mihael Smelchanskiy | — | (818) 881 4126 | HVAC | West Hills · Los Angeles County | — | — |
| A E HVAC & Electrical INC | Milorad Milosevic | — | (213) 304 7124 | HVAC | Los Angeles · Los Angeles County | — | — |
| A Electrical Enterprise | Erick Eduardo Escalante Marroquin | — | (626) 620 1465 | HVAC | Northridge · Los Angeles County | — | — |