The capacity of a heat pump system is measured in tons (1 ton of heat is 12,000 Btu/hr. or 3.5 kilowatts). A GSHP system costs $5,000 to $12,000 a ton, depending upon conditions of the home, especially ducting requirements. Insulation and weatherization are especially important considerations. If your home is poorly insulated, and has leaky windows and doors, improve those before getting an estimate for a new energy system. Most efficiency measures will be cheaper than the cost of a GSHP sized to make up for the inefficiencies.
With a return on investment of approximately three to five years, the Priors have gained independence from volatile oil prices and have a reliable system that will provide heating, cooling, and hot water for years to come.