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 the alternative heating system and central air conditioner.
To calculate your return on investment (payback in a number of years), divide the annual savings into the additional cost. When you install a geothermal system in a new home, the monthly savings in operating costs will generally offset the additional monthly cost in the mortgage, resulting in monthly positive cash flow immediately.
Keep in mind that energy savings are only one of the many benefits you receive from a geothermal system.
