Nowadays Air-conditioning system has become a basic need in our life, as every year summers are getting hotter & hotter. As a consumer, it is difficult to choose the best air-conditioning system for a particular usage. The variable Refrigerant Flow system is suitable for applications that demand long working hours for air-conditioners & longer span of life mostly for commercial purposes like Hotel, Hospital, Offices & mid segment residence as well, while fixed speed air-conditioning system is suitable for application that needs shorter working hours for air-conditioners & small investment like small houses, shops, cafe, etc.