APPARATUS

Apparatus for heating an operator's cab (14) of a vehicle or machine, comprising a cab air heating unit (16) and a cab air duct (17) for conducting air toward an interior region of the cab (14) from the cab air heating unit (16), wherein an external air intake (19) for conducting external air to an inlet side of the cab air heating unit (16) includes a condensing conduit (20) extending through at least part of the cab air duct (17) so that, in use, when the condensing conduit (20) is subject to a flow of external air at a temperature below that of the air passing through the cab air duct (17), an outer surface of the condensing conduit (20) acts as a condensing surface on which moisture in air passing through the cab air duct (17) condenses.