People's well-being has become increasingly important in the planning, operation and design of ventilation and air conditioning systems in the last years. Trox are leaders in this field with their air-water systems. The separation of ventilation and cooling functions is greatly contributing to an increase in the thermal comfort in buildings. Along with an improvement in thermal comfort, the operating costs can be also considerably reduced. Excess heat is basically removed by water as a transportation medium which, compared with air, only requires 0.3% of the pipe diameter and 5% of the transport energy. This is why air-water systems are not only suitable for use in new buildings, but also especially for use in reconstruction measures because of their minimum space requirements. Along with chilled ceilings, Trox also offers further air-water systems such as cooling convectors, ceiling induction diffusers, displacemant flow induction diffusers and fan coil units.