Fixed frequency: Rated speed can not change the central air-conditioning company in Xi'an, repeatedly start not only power consumption, but also cause indoor temperature difference of plus or minus 2 degrees Xi'an central air conditioning agents, comfort is not strong, but also bring slow cooling and heating, voice of Xi'an central air-conditioning manufacturers, short life and other issues. DC inverter: DC inverter is more superior than the AC frequency. The use of DC digital variable speed compressors, only after a voltage converter, AC frequency than 18-40% of the energy savings. Central air conditioning Which Xi'an, Xi'an Hao Electrical and Mechanical Services (certification), Xi'an, Xi'an Hao central air conditioning provided by the Electrical and Mechanical Technology Limited. Xi'an Hao Electrical and Mechanical Technology Co., Ltd. (www.029hfkt.com/)(www.029hfkt.com) is Xi'an, central air conditioning leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. Xi'an Hao Electrical and Mechanical Services leadership with the staff warmly welcome all inquiries negotiations to create the Electrical and Mechanical Xi'an Hao better future.