The present disclosure concerns a charge cooler with an air cooler in a first air path and with a bypass in a second air path which is connected in parallel to the first air path, wherein a thermal insulation is assigned to the bypass which thermally isolates the bypass from the air cooler, wherein the air cooler has a double-walled base body with an outer wall and with an inner wall, wherein the thermal insulation is arranged on the inner wall. The present disclosure also concerns a valve for such a charge cooler, and a turbo-charged internal combustion engine with such a charge cooler, and a motor vehicle with such an internal combustion engine.