In the long run it would cost less due to its higher efficiency. Engineering and contracting overhead was minimal since the heat pump supplier contracted directly to the general contractor. Energy costs at Salem Elementary School are as low as its capital costs. The old school had a wood furnace which operated 24 hours per day, so a direct energy comparison is difficult. Each classroom is heated and cooled by 2.5 ton GeoExchange units.
Larger units supply the gym, cafeteria, and other spaces.
Units mount above the school's two hallways and conditioned air is ducted into the four quadrants of each classroom. Numerous design features are responsible for the school's low energy use. According to the mechanical contractor, Steven Hudson, ventilation fans are provided to the kitchen, gym, and restrooms. Ventilation for the building is migrates through the steel siding of the ceiling area and down drafts through the hung ceiling in each room. Classrooms have opening windows, but he claims these are seldom used.