a controlled fuser assembly for a reproduction apparatus . the fuser assembly includes a fuser member for fusing a marking particle image to a receiver member and a cooling system for controlling the temperature of the fuser system . optional external heater rollers have a heat transfer surface adapted to be selectively engaged with the fuser member , and a device for heating said heat transfer surfaces . a mechanism is provided for controlling the heat transfer with the fuser member to selectively change the amount of heat transferred from the fuser .