Inverter technology refers to the compressor within the outdoor unit of the air conditioner. The two most common types of compressors are the fixed speed compressor and the variable speed compressor. GoldFin is an anti corrosive treatment on the surface of the heat exchanger in the outdoor unit. The operator can set the timer and program the air conditioner for a period of one week. Air volume can be optimised to reduce noise and comply with the system design utilising ESP technology.