Services in the field of technical building trust, creation of energy concepts, heating-ventilation-air conditioning-sanitary consulting services (HLKS consulting) and planning of heating, ventilation, air conditioning and sanitary systems (HLKS planning); may establish branches and subsidiaries, participate in other companies, acquire or sell other companies, acquire, encumber, manage and sell real estate and securities, take out and grant loans, provide guarantees and other securities, as well as acquire, manage and exploit intellectual property rights.