Chilled beams are energy efficient systems that combine radiant cooling and ventilation. They are reportedly cost-effective to install, and they reduce energy usage in a building, while improving comfort levels. These systems are seen throughout Europe but are not widely known the U.S. They are mostly installed in commercial buildings, where the low investment costs and high cooling capacity is a very attractive combination. Some of companies making chilled beams are Flakt Woods and Trox Technik.