Although mostly my engineering research, teaching and consulting concerned mechanical design, my PhD research was about heat transfer. At IIT a study I did many years ago for the Window Shade Manufacturers Association investigated the benefits of window shades in controlling heat loss/gain through windows. For that study another professor and I built a carefully insulated room with a typical window in one wall. Direct sunlight was simulated with a bank of Kodak projector bulbs. Measuring flow rate and temperature of airflow circulated showed the reduced heat gain when the shade was pulled down.