Does rigid slab insulation negatively affect the cooling properties of a basement?

Zone 5, mountains of Utah. Adding an addition that will be built into the hillside.  Radiant heat in the slab.  While lack of insulation obviously means it’s going to take more… Zone 5, mountains of Utah. Adding an addition that will be built into the hillside.  Radiant heat in the slab.  While lack of insulation obviously means it’s going to take more…Read MoreGreenBuildingAdvisor