4-Ton ClimateMaster Water-to-Air Geothermal Heat Pump installed in May, 2010. In addition, the existing oil-filed furnace and oil-fired hot water tank was removed. Two new electric hot water tanks were added, one acting as a buffer tank, and the other as the primary source of heat. This system was installed by Alternative Carbon Energy Systems, Inc. (ACES-Geothermal).