Air Compressors / Industrial Products Large-Cooling-Systems Import Export Offers

In Pakistan, more than 600 cold stores are being used for the storage of fruits and vegetables. Mostly are Ammonia based cooling system. Local machinery is not energy efficient while cost of energy is very high. I want to introduce energy efficient ammonia cooling system. In this context, I am interested to know the available ammonia based compressor for 50 to 5000 MT storage system. The require temperature is about 0 degree C in mostly cold stores.