| HANG NGAI AIRCONDITIONING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| HANG SENG AIR-CONDITIONING CO. LIMITED | Private company limited by shares | Dissolved |
| WING HANG AIR-CONDITIONING LIMITED | Private company limited by shares | Live |
| WING HANG AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| HARMONY AIRCONDITIONING & ENGINEERING LIMITED | Private company limited by shares | Live |
| Hercules Air-Conditioning Engineering Co., Limited | Private company limited by shares | Live |
| HESCO AIRCONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MAN HING AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Live |
| TAI HING AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| CHI HING AIR-CONDITIONING LIMITED | Private company limited by shares | Live |
| Wah Hing Air-Conditioning Limited | Private company limited by shares | Live |
| CHUNG HING AIRCONDITIONING LIMITED | Private company limited by shares | Live |
| SAN HING AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| HING YIP AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| WING HING AIR-CONDITIONING CO. LIMITED | Private company limited by shares | Dissolved |
| WING HING AIR-CONDITIONING ENG. LIMITED | Private company limited by shares | Live |
| HONEST AIR-CONDITIONING HOLDING LIMITED | Private company limited by shares | Dissolved |
| HONEST AIR-CONDITIONING LIMITED | Private company limited by shares | Live |
| DAIKIN AIRCONDITIONING (HONG KONG) LIMITED | Private company limited by shares | Live |
| KONG LUI AIRCONDITIONING (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| HONG KONG VILLA AIR-CONDITIONING LIMITED | Private company limited by shares | Dissolved |
| KERRY AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| FOR TIN AIR-CONDITIONING ENGINEERING (HONG KONG) LIMITED | Private company limited by shares | Live |
| KOON LEI AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| KOON KWAN AIR-CONDITIONING ENG. LIMITED | Private company limited by shares | Live |
| LEUNG'S AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MACHOICE AIRCONDITIONING (ASIA) LIMITED | Private company limited by shares | Dissolved |
| MASTER AIR-CONDITIONING & ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| MERCANTILE AIR-CONDITIONING AND ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MODERN AGE AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| NEWSTAR AIR-CONDITIONING LIMITED | Private company limited by shares | Live |
| KAM NGAI AIR-CONDITIONING LIMITED | Private company limited by shares | Live |
| KIN NGAI AIR-CONDITIONING LIMITED | | Live |
| Pacific Air-Conditioning Limited | Private company limited by shares | Live |
| HungXin Air-conditioning Parts Centre Limited | Private company limited by shares | Live |
| FOOK ON AIR-CONDITIONING AND REGRIGERATION PARTS LIMITED | Private company limited by shares | Dissolved |
| WAH KEE AIR-CONDITIONING & REFRIGERATION ENGINEERING LIMITED | Private company limited by shares | Live |
| REGENT AIR-CONDITIONING APPLIANCES ENGINEERING LIMITED | Private company limited by shares | Live |
| RICHCORP AIRCONDITIONING LIMITED | Company limited by guarantee | Dissolved |
| RICHMAX AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Live |
| SANSUNG AIR-CONDITIONING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| WAH NAM AIR-CONDITIONING SERVICE COMPANY LIMITED | Private company limited by shares | Dissolved |
| SHING CHEONG AIR-CONDITIONING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Shing Fung Air-Conditioning Company Limited | | Live |
| SHING FUNG AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| MEI SHUM AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| SUMMIT AIR-CONDITIONING ENGINEERING CO., LIMITED | | Live |
| SUNRISE AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Live |
| SUNSHINE AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| New Tech Air-Conditioning Engineering Limited | Private company limited by shares | Dissolved |
| AA Air-Conditioning Trading Company Limited | Private company limited by shares | Live |
| CHUNG WAH AIR-CONDITIONING & TRADING COMPANY LIMITED | Private company limited by shares | Live |
| TAT TUNG AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| MAN TUNG AIR-CONDITIONING E & M LIMITED | Private company limited by shares | Live |
| TAI TUNG AIR-CONDITIONING & ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Tung Lik Air-Conditioning & Engineering Company Limited | | Live |
| UNITED AIR-CONDITIONING & ELECTRICAL ENG. LIMITED | Private company limited by shares | Live |
| VICTORY AIR-CONDITIONING & ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| WANG HEI AIR-CONDITIONING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Wang Tai Air-Conditioning Engineering Company Limited | Private company limited by shares | Live |
| Wang Yip Air-conditioning Engineering Co. Limited | | Live |
| ALL WELL AIR-CONDITIONING LIMITED | Private company limited by shares | Live |
| WESTCO AIRCONDITIONING LIMITED | Private company limited by shares | Live |
| WHARF AIR-CONDITIONING & ENGINEERING CO., LIMITED | Private company limited by shares | Dissolved |
| WINFUL AIR-CONDITIONING LIMITED | Private company limited by shares | Dissolved |
| WING TAI AIR-CONDITIONING LIMITED | Private company limited by shares | Dissolved |
| WING FAT AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| WING FAT AIR-CONDITIONING LIMITED | Private company limited by shares | Dissolved |
| WING MAU AIR-CONDITIONING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| WING KEE AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| WING TAT AIR-CONDITIONING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| WING LEE AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| FU WING AIR-CONDITIONING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| WING WO AIRCONDITIONING ENGINEERING LIMITED | | Live |
| WING FAI AIR-CONDITIONING SERVICE LIMITED | Private company limited by shares | Live |
| Wing Lee Air-conditioning Service Limited | Private company limited by shares | Live |
| WING'S AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| Wing's Glory Air-Conditioning Company Limited | Private company limited by shares | Live |
| WINNER AIR-CONDITIONING ENGINEERING LIMITED | Private company limited by shares | Live |
| WINNING AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| Fai Wong Air-Conditioning Engineering Limited | Private company limited by shares | Live |
| CHIU YIP AIR-CONDITIONING WORK LIMITED | Private company limited by shares | Dissolved |
| ELECTROSTAR AIR-CONDITIONING WORKS LIMITED | Private company limited by shares | Dissolved |
| HING FAT AIR-CONDITIONING WORKS LIMITED | Private company limited by shares | Live |
| MAN TUNG AIR-CONDITIONING WORKS LIMITED | Private company limited by shares | Live |
| WORLDTECH AIR-CONDITIONING ENGINEERING LIMITED | | Live |
| WUITAI AIRCONDITIONING LIMITED | Private company limited by shares | Live |
| YING WAH AIR-CONDITIONING LIMITED | Private company limited by shares | Live |
| YAT YUET MOTOR AIR-CONDITIONING COMPANY LIMITED | Private company limited by shares | Dissolved |
| CHUNG SHING AIR-CON.ENGINEER LIMITED | Private company limited by shares | Live |
| AIRCONISM LIMITED | | Live |
| AirconMiser Limited | Private company limited by shares | Live |
| AIRCONNECT SOLUTIONS (ASIA) LIMITED | Private company limited by shares | Live |
| AIRCONparts Limited | Private company limited by shares | Live |
| AIRCONTACT OVERSEAS LIMITED | Private company limited by shares | Dissolved |
| AIRCONTACT TRAVEL SERVICE LIMITED | Private company limited by shares | Dissolved |
| CLASSIC AIRCOOL CO., LIMITED | Private company limited by shares | Live |
| FOREST AIRCOOL ENGINEERING(HK) CO., LIMITED | Private company limited by shares | Live |
| AIRCOOL ELECTRONICAL LIMITED | Private company limited by shares | Live |
| Aircool Engineering Limited | Private company limited by shares | Live |