For more than 100 years, temperature control has been the principal concern of our industry. That focus and our collective efforts have achieved immense improvements in the human condition – improvements so fundamental that they are usually overlooked and unappreciated, even by ourselves. We seldom reflect on what the world was like before the refrigeration of food and medicine, or before the availability of low-cost, reliable heat in the winter and cooling in the summer. However, in spite of- or because of- those achievements, the expectations of the public have moved higher.