FAQ: How long is the payback period for your geothermal heat pump system?

To figure this accurately, you must know how much per year you'll save in energy costs with a geothermal system and the difference in costs between it and a conventional heating system and central air conditioner. As an example: If you'll save $700 per year with a geothermal system and the cost difference is $2,000, your payback will be less than three years.