The core activity of Züllig + Rusch GmbH is the planning, consulting and realization of building technology projects, particularly in the areas of heating, ventilation, air conditioning and sanitation. This includes the development of individual energy concepts, the planning and installation of various heating systems such as heat pumps, solar systems, wood-fired heating systems and ice storage heating systems, as well as the implementation of ventilation and air conditioning systems. In addition, the company provides energy consulting and supports the creation of permit documents and funding applications.