How does a geoexchange system help keep a house, say in Wisconsin, warm in the winter time? A system of pipes laid in the deep soil is used to pump latent heat into the house. Trick questiona geoexchange system wouldn't work in Wisconsin because it is too far north. Hot water heated by shallow magma is circulated through the house in a radiator system. Passive solar energy warms water, which then is circulated underneath the house