KOOLJET is the foremost manufacturer of cooling systems for agriculture and frozen foods. Easy to install through the wall an ... d through the roof models, tunnel-coolers, hydro-coolers, fluid coolers and more can be used for temperatures between 55F and MINUS 75F! KOOLJET is an authority of the proper methods for assuring a long shelf life of vegetables, fruits, herbs and other commodities. Temperature, humidity, air-exchange, CO2/O2 balance are all well developed technologies at KOOLJET. NEW Cold-Storage Calculator is based on the most recent USDA data. read more