Chosen mechanicals for superior indoor air quality and healthy home comfort. 1) Build Equinox's Conditioning ERV which alone keeps house comfortable much of the year, with 2) add on of a Geo-loop which pre conditions the air from a ground source heat exchanger adding 15% efficiency to the system 3) Mitsubishi heat pump for heavier load heating and cooling needs 4) Radon pipe going from under slab to roof top.