| Manring Heating & Air | C-21A, C-21B, C-21D | Active |
| McClure Stainless LLC | C-21 | Active |
| Mechanical Group | C-21 | Active |
| Mechanical Products Nevada | C-21 | Active |
| Mechanical Services Of Southern Nevada | C-21B | Active |
| Mesa Mechanical Inc | C-21 | Active |
| Metropolitan Mechanical LLC | C-21B | Active |
| Mission Mechanical LLC | C-21 | Active |
| Monarch HVAC Services LLC | C-21B | Active |
| Monster Mechanical LTD | C-21 | Active |
| Mosair LLC | C-21 | Active |
| Mountainview Air LLC | C-21B | Active |
| Mr AC LLC | C-21B | Active |
| Mr Cool LLC | C-21 | Active |
| Mr Gates Heating And Cooling LLC | C-21B | Active |
| MRW Mechanical LLC | C-21B | Active |
| Mullet Man Air Conditioning LLC | C-21B | Active |
| My Guy Inc | C-21 | Active |
| Nathans Air Conditioning & Heating LLC | C-21 | Renew by Nov 30, 2026 |
| Nebula Air Heating & Cooling & Refrigeration LLC | C-21B | Active |
| Nec Tec Services | C-21B | Active |
| Nevada Air Service LLC | C-21B | Active |
| Nevada Cooling And Heating LLC | C-21B | Renew by Dec 31, 2026 |
| Nevada Filter Service | C-1F | Active |
| Nevada Heating Cooling Plumbing | C-21 | Active |
| Nevada Residential Services LLC | C-21 | Active |
| Nevada Serv Co | C-21 | Active |
| Nevada State Air Conditioning & Heating LLC | C-21 | Active |
| Nevco Air Conditioning & Sheet Metal Inc | C-21 | Active |
| Night City Air LLC | C-21B | Active |
| Non Stop Air LLC | C-21B | Renew by Dec 31, 2026 |
| Noorda Sheet Metal Company | C-21C | Active |
| Nordic Heating & Cooling LLC | C-21A, C-21B | Active |
| Nova Air LLC | C-21B | Active |
| Number One Plumbing Heating & Air Conditioning Inc | C-21 | Active |
| NVLV Heating & Cooling LLC | C-21B | Active |
| Oahu Air LLC | C-21B | Active |
| Olympus Plumbing Inc | C-21 | Active |
| One Hour Air Conditioning & Heating | C-21 | Active |
| One Stop Cooling And Heating LLC | C-21B | Active |
| Ontario Refrigeration Service Nevada Inc | C-21 | Active |
| Options Air Conditioning & Heating LLC | C-21B | Active |
| Oui Air Heating And Cooling | C-21A, C-21B | Active |
| Owens Air LLC | C-21D | Active |
| P1 Construction LLC | C-21 | Active |
| Pacific West Air Conditioning & Heating LLC | C-21 | Active |
| Padillas Services LLC | C-21B | Active |
| Passionate Cooling & Heating LLC | C-21B | Active |
| Patriot Air Conditioning LLC | C-21 | Active |
| Payless Heating & Cooling LLC | C-21 | Active |
| Perfect Air & Pipe LLC | C-21A, C-21B | Active |
| Petes Climate Control Solutions | C-21 | Active |
| Platinum Mechanical LV LLC | C-21B | Active |
| Polar Air & Heating Inc | C-21 | Active |
| Preferred Electric LLC | C-1A + C-1D | Active |
| Preferred Electric LLC | C-21 | Active |
| Premier HVAC Services LLC | C-21A, C-21B | Renew by Nov 30, 2026 |
| Prestige Mechanical & HVAC LLC | C-21 | Active |
| Pride Mechanical LLC | C-21 | Active |
| Pride Mechanical LLC | C-1F | Active |
| Primary Air LLC | C-21B | Active |
| Prime Heating & Air Conditioning Inc | C-21 | Active |
| Pro Price Heating And Cooling LLC | C-21 | Active |
| Pro Tech Air LLC | C-21 | Renew by Dec 31, 2026 |
| Property Pros Air Conditioning And Heating LLC | C-21B | Active |
| Pure Plumbing LLC | C-21B | Active |
| Quick Air Cooling & Heating LLC | C-21B | Active |
| R & R Heating & Air Inc | C-21 | Active |
| R & T Air Conditioning And Refrigeration LLC | C-21B | Active |
| R B Rockwell Brothers Air Conditioning Heating And I A Q Experts | C-21B | Active |
| R W Mechanical Inc | C-21 | Active |
| Rancho Refrigeration LLC | C-21 | Active |
| Rebel Refrigeration A/C & Plumbing | C-21 | Active |
| Red Mesa Mechanical LLC | C-21 | Active |
| Red Rock Heating And Cooling LLC | C-21B | Active |
| Referral Air Conditioning Service Inc | C-21 | Active |
| Reliant Plumbing Heating And Air | C-21B | Active |
| Renes Heating & Air LLC | C-21 | Active |
| Repair First Heating & Air Conditioning LLC | C-21B | Active |
| Resorts World Las Vegas LLC | C-21 | Active |
| Resq LLC | C-21 | Renew by Dec 31, 2026 |
| Revere Mechanical LLC | C-21 | Active |
| Right On Plumbing LLC | C-21B | Active |
| Rocket Air Conditioning LLC | C-21 | Active |
| Rogue Mechanical | C-21 | Active |
| Royal Metal Works Inc | C-21 | Active |
| Royal Refrigeration Inc | C-21 | Active |
| Royalty Comfort LLC | C-21 | Active |
| Roys Mechanical Services | C-21 | Active |
| Ruiter Construction LLC | C-21 | Active |
| Ryan Mechanical Inc | C-21 | Active |
| S 3 H Inc | C-21 | Active |
| S C Refrigeration LLC | C-21A | Active |
| Safari Air Heating & Cooling LLC | C-21B | Active |
| Sahara Air Conditioning & Heating Inc | C-21 | Active |
| Santos Heating And Cooling LLC | C-21B | Active |
| Save On Air Conditioning & Plumbing | C-21A, C-21B | Active |
| Schneider Electric Buildings Americas Inc | C-21B | Active |
| Semi Electric Inc | C-21 | Active |
| Semper Fi Heating And Cooling | C-21 | Active |