4.42J (or 2.66J or 1.044J), Fundamentals of Energy in Buildings, is an undergraduate class offered in the Department of Architecture, and jointly in the Department of Civil and Environmental Engineering and the Department of Mechanical Engineering. It provides a first course in thermo-sciences for students primarily interested in architecture and building technology. Throughout the course, the fundamentals important to energy, ventilation, air conditioning and comfort in buildings are introduced. Two design projects play a major part in this class. They will require creative use of the principles and information given in the course to solve a particular problem, relating to energy consumption in buildings. The students will be asked to propose and assess innovative building designs, technologies and operating schemes that will yield an outstanding sustainable building.