Abstract: An individual, customized individual cooling unit operably retainable to (i) a metallic container for holding chemicals, such as polyols/blowing agent mixture for use in the production of polyurethane foam to be cooled, wherein the container has an outer surface, and (ii) a refrigerator. The cooling unit has (a) a metallic thermal conductor having a first surface contractable with the container adjacent the container outer surface; and a second surface; (b) a thermal insulation layer adjacent the second surface; (c) coolant first conduit between the outer surface of the container and the thermal insulation layer, and having a coolant first inlet and a coolant first outlet; and (d) a retainer for retaining the cooling unit to the container outer surface. The cooling unit and the refrigerator provide for the storage of the chemical at a safe temperature in a convenient, clean manner, with minimum energy usage in temperature control.