2300 SF bi-level house, 1000 SF is a lower level with 2/3 below grade. Built in 1981, we purchased in 1991.
In 1998 had a Waterfurnace Premier2 installed. This 2.3 ton geothermal heat pump, with a desuperheater, replaced baseboard electric heat and a coal stove. The ground loop consists of two 175' deep vertical boreholes, with a 20% methanol mix, protected to 15º F. In 2016 we replaced the electric water heater with a GE 50 gallon hybrid tank.
Our overall goal, just trying to be smart with our energy usage.