Slinky loops are made of geothermal pipe that is coiled into many loops and buried in horizontally dug trenches in the earth. The plastic heat exchanger pipes are typically laid flat in a circular pattern at the bottom of a trench. The Slinky Loop design is a horizontal closed loop designed for areas of less land and shorter trenching. This loop requires more pipe, but less land (and excavating cost) than a single pipe trenched horizontal loop. It will often require a larger diameter pipe, and thus more antifreeze (making it more costly), than a single-pipe, trenched horizontal loop. Other design factors should be considered with a slinky loop system, so be sure to ask your contractor about the loop design parameters.
