A device 100 for injecting ions into a stream of air 110. The device comprises a housing 102 an electric circuit 104 inside the housing an electrically conductive element 106 coupled to the electric circuit for emitting ions 112, at least a portion of the conductive element being exposable to at least a portion of the stream of air for injecting the ions into the stream of air and a heater element 105 disposed inside the housing for heating one or more circuit elements of the electric circuit.
