Heat pump

Caption: "Heat pump--One compact unit to heat homes in the winter and cool them in the summer is what these [two] mechanical engineering students are working on. By a flick of a switch heat can be drawn up from coils buried 10 feet in the earth. On warm days the operation is reversed and hear from the house is drawn into the ground coils;." sign on machinery: "Refrigerator contains 6 lbs. Freon 12."