Yeah, I think you have to do more than just have a few south-facing windows to make it work.

Lots of factors go into it - which is a problem in a way, since you can't expect a lot of construction companies to cover all the complicated details well. I suppose the remedy is either hire a company that specializes in solar, or be the general contractor yourself and ride herd on the subcontractors. Or build the whole thing yourself!
Of course house siting is very important too. Makes no sense to try to capture smallish heat flows, but site the house out exposed to winter winds. At least, I guess that's true. The house we have outside of Cody is pretty darn exposed. I may have to try adding some trees to cut the wind speed a bit...
"Annualized Geo-Solar" is also worth looking at.
Wyoming should be near ideal for solar:
1) Very little if any permitting needed, so little bureaucrat ass-kissing to get something "experimental" approved.
2) A fair amount of sun in the winter.
3) Usually not much problem with being shaded by trees!
4) Low rainfall means underground works better than in most places.
The one downside of underground designs is having to deal with radon, which is a problem all over the Mountain West.