Radon is particularly prevalent in Iowa. A completely closed up house is the worst thing for it! My dad spent a few years thinking through details about the ho

Radon is particularly prevalent in Iowa. A completely closed up house is the worst thing for it! My dad spent a few years thinking through details about the house before building. Passive radon mitigation was built in (active added later), air exchanger would bring in new air without losing all the heat/cold of the conditioned air, radiant floor heating in the basement, ~24" of blown in insulation in the attic, 6" walls for additional insulation, 24" eves give a bit more shade around the house.