As a leader and one of the largest professional heat pump manufacturers in China,we have a complete industrial chain,for example , the sheet metal parts,heat exchangrs including evaporators and condensers are all made in house or by our partners that we have a stake.It helps us better control the quality.optimize the performance easily and ensure on-time delivery. A lot of quality suppliers have established strategic development partnership with us,such as Emerson,Sanyo,and Panasonic.Compared with other manufactures,we are given priority when purchasing most of the key materials & parts.