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Foundation Heat Exchangers (FHX) are a novel form of ground heat exchanger for residential applications. The recently developed dynamic thermal network approach has been applied to formulate a model of the FHX that includes the basement, pipes and adjacent ground. This response factor approach allows complex three-dimensional geometries, such as this, to be represented and simulated efficiently. The formulation of the method and its application to the FHX is described along with a numerical procedure to calculate the required weighting factor series. An improved method of calculating these data and reducing it to a compact form is presented. Some modification of the original method has also been necessary to implement the boundary conditions associated with the heat exchanger pipes and ground surface. Data from an installation at an experimental house have been used to validate the model.