The objective of this technical evaluation was to determine whether geothermal energy obtained from a well could be used to heat a building at the Naval Air Rework Facility (NARF) and produce a significant saving of oil used without an economic loss. The electronic integration hangar, designated LP-l67, was selected for study, as it was a single-story building with a large floor area. Because of the high ceiling and the sliding doors necessary to admit aircraft, the heat loss rate, based on floor area, was about twice that of commercial buildings. It was furnished with an oil-fired hot water heating system capable of high thermal output to meet heating requirements in the coldest weather