The present invention relates to a device for autonomous production of cold approximately 40°C below ambient temperature from a low-temperature solar thermal source (200), said device comprising (i) a reactor (202) designed to cool and/or heat the solid reagent (502), (ii) a condenser (207), (iii) a first reservoir (208) for storing the liquid refrigerant (217) at ambient temperature, (iv) a chamber (215) designed to store a phase-change material and also comprising an evaporator (212), (v) a second reservoir (209) for storing the liquid refrigerant (217) at low temperature, (vi) means (203, 211, 214, 216, 504) for conveying the refrigerant and (vii) means (204-206) for controlling the refrigerant flow rate.