Coolbest heat pump dryer, national invention patent has safety environmental protection high temperature refrigerant, unique in the United States of America high efficiency heat exchanger, environmental protection, no pollution. The security and stability of the pump structure. My company's high temperature heat pump drying machine is mainly used for: tobacco, leather, cloth, clothing, mosquito coils, mushroom, dehydrated vegetables, grain, fertilizer, pharmaceuticals, sludge, coal, coal, lignite, wood drying. Unit has high energy efficiency ratio, economy energy, safety and stability. General electric boilers, oil-fired boiler drying energy consumption from 1/4 to 1/3.