Chilled beams have been prevalent in Europe for many years, and have become one of the latest HVAC products to be adopted by engineers in the U.S. In fact, millions of square feet (square meters) are heated and cooled with these devices every day. Simply put, they are air-to-air induction diffusers with a coil. Much like any other piece of building equipment, there is a need to balance both first cost and effective performance. However, the complexity of the product is such that if improperly selected, may lead to unsatisfactory room temperatures, drafty conditions, or wasted energy. In this column, Dan describes the process for selecting chilled beams.