Ground Source Heat Pump-Lines/ Rat Slab

This is an earlier photo (July 2013) with Ruth and Helen (our daughter) showing off the ground source heat pump piping coming into the house. We are having a conditioned crawl space. So, in the background you see the floor of the crawl space with the rat slab on top of three inches of foam on top of radon gas barrier. Then under that sand and rock with three inch pipe to vent the radon gas. The crawl space will be the return plenum for the furnace so no outside venting is required. It is well insulated so the crawl space will be the same temp as the house and temper the air in the house This eliminated the use of underfloor insulation and the rat slab will keep critters from digging into the house.   thank you for the kind words..