Installation, maintenance, and repair of heating, ventilation, and air conditioning systems, as well as the implementation of ventilation, air conditioning, heat pump, wine cellar, refrigeration, sanitary, electrical, and energy technology systems; purchase, sale, and rental of energy systems; design and implementation of wine cellars from A to Z (refrigeration system, insulation, wall cladding, wine racks, flooring, etc.); purchase, sale, and rental of real estate and movable assets (see articles of association for full purpose).