Treatment facility for treating workpieces, in particular for coating and/or for drying vehicle bodies, having a) a treatment installation (14A; 14B) which has a housing (16; 56) in which a treatment space is accommodated; b) a transport system (32A, 32B) which comprises a multiplicity of transport carriages by means of which the workpieces are able to be transported through the treatment space, wherein each transport carriage comprises a chassis, a drive system and a fastening device for at least one workpiece, wherein the fastening device is coupled to the chassis by means of a connecting device, and wherein each transport carriage has at least one atmosphere-sensitive component, the operation of which is capable of being impaired by one or more harm parameters of a harmful atmosphere surrounding the atmosphere-sensitive component, in particular by the temperature or the composition of the surrounding harmful atmosphere; wherein c) provision is made outside the treatment space of a travel space for the chassis, in which the harmful atmosphere can prevail, wherein the travel space is delimited at least regionally by a travel-space housing; d) the travel space is connected via a connecting passage to the treatment space in such a way that the chassis of a transport carriage is movable in the travel space and the fastening device is carried along in the treatment space and the connecting device extends through the connecting passage, characterized in that e) provision is made of a compensation apparatus (126; 128) by means of which compensation is possible for at least one harm parameter of the harmful atmosphere surrounding the atmosphere-sensitive component; wherein f) a transport carriage carries along the compensation apparatus, in particular a cooling apparatus; and/or a transport carriage is configured to cooperate with the compensation apparatus, in particular a cooling apparatus, and comprises a coupling device (178; 190) by means of which the transport carriage is able to be coupled to the compensation apparatus. a) a treatment installation (14A; 14B) which has a housing (16; 56) in which a treatment space is accommodated; b) a transport system (32A, 32B) which comprises a multiplicity of transport carriages by means of which the workpieces are able to be transported through the treatment space, wherein each transport carriage comprises a chassis, a drive system and a fastening device for at least one workpiece, wherein the fastening device is coupled to the chassis by means of a connecting device, and wherein each transport carriage has at least one atmosphere-sensitive component, the operation of which is capable of being impaired by one or more harm parameters of a harmful atmosphere surrounding the atmosphere-sensitive component, in particular by the temperature or the composition of the surrounding harmful atmosphere; wherein c) provision is made outside the treatment space of a travel space for the chassis, in which the harmful atmosphere can prevail, wherein the travel space is delimited at least regionally by a travel-space housing; d) the travel space is connected via a connecting passage to the treatment space in such a way that the chassis of a transport carriage is movable in the travel space and the fastening device is carried along in the treatment space and the connecting device extends through the connecting passage, characterized in that e) provision is made of a compensation apparatus (126; 128) by means of which compensation is possible for at least one harm parameter of the harmful atmosphere surrounding the atmosphere-sensitive component; wherein f) a transport carriage carries along the compensation apparatus, in particular a cooling apparatus;