In a printer or copier at least one printing unit is provided that generates at least one toner image on at least one page of a carrier material. The printer or copier also has at least one fixing unit that fixes the toner image on the carrier material with aid of a heat generated by the fixing unit. The printer or copier also has a refrigerator to which is supplied at least a part of the heat generated in the fixing unit. The refrigerator uses at least a part of the supplied heat for generation of cold.