GTH founded a subsidiary on 24 July 2014. The shipbuilding company MTH offers planning and engineering services as well as the complete construction work in the field of air conditioning and refrigeration technology. Areas of activity are primarily conversions of cruise ships of all sizes (so-called revitalization projects) and yachts.

In addition to the expansion, renewal or conversion of the existing air conditioning and refrigeration systems, MTH also takes over and coordinates the associated work in the field of automation, electrical engineering, pipeline installation and steel construction.

In the maritime industry, the topics of energy saving and the environment are becoming increasingly important. MTH has developed concepts and solutions that can be specially adapted to the conditions and usage profiles on board.