what you are saying might be true for the specific case of a net zero home in a cold weather climate, but there is no way that all or even remotely close to some large % of new construction is being built to net zero. I have no issue with someone wanting to live out their green fantasy with a net zero home, but lets be real, that is most certainly not the average or even above average build. It gets exponentially expensive to make the envelope tighter and tighter to squeeze the last BTU of heat loss out of the home. maybe more so then installing geo - priced triple pane windows from europe lately? So to generally say that geo in new construction doesn't make economical sense is totally wrong. That might be true for the very very specific case of a net zero home, but only because they have so little heat loss to start with that any low cost heating system will work.