Two system WaterFurnace 5 series geothermal heating equipment preventive maintenance tune-up, cleaning, filter inspections, safety inspection, run test. Homeowners initial concerns were cold and drafty in the evenings. Both 5 series single stage systems have add-on 10KW electric heat accessory kits however the newer master bedroom addition system has never ran in auxiliary or emergency heat due to the fact that the interconnecting wiring from the air handler to the heat strip package was never completed at the heat strip pack end. Finish low voltage control wiring at the heat strip pack and test run equipment in all heat modes. Confirm 10KWs operation on both systems and neither system had any active or stored service codes outside of the normal hot water generator and system cycle counters Suspect that the master bedroom equipment system has lower than usual ground loop temperatures causing the freezing at the uninsulated joints in the crawl space basement and also lowering the sup