The objective of this study is to examine the feasibility of swimming pool heating with geothermal heat pump (GHP) systems in residential applications. Six locations with varying climates are examined across the U.S. A contour plot is presented for use in estimating the potential reduction in ground loop size as a function of the total annual building loads and the total annual swimming pool heating load. Results show that ground loop lengths may be reduced by up to about 20% in southern U.S. climates with the addition of a swimming pool, but may be as much as double in northern U.S. climates