The study, realization, maintenance and after-sales service of heating, ventilation, air conditioning, refrigeration, production and distribution of chilled water, installation of renewable energy production solar, photovoltaic and geothermal, centralized technical regulation and management, sanitary installations, as well as all general contractor mandates and all service performances for the operation, maintenance, troubleshooting, repair, monitoring, metering and energy management in the field of climate engineering and building technical installations as well as the operation and maintenance of hotel installations.