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 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 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 ; <EOS>