When I built my house I used 2x6s so the outside walls are very good. The SE wall is mostly windows and when the sun is shining the furnace hardly runs. Before the furnace was installed I was working in the house doing trim work on a 2* day and could work in a long sleeve shirt reasonably comfortable.
The last few winters the LP use has been 600gal a year. I have a 500gal tank which means a fill is 400gal and we normally need gas in late Jan or early Feb. This year we called in early Jan and they would only give us 150gal. That was gone in 1 month (coldest month of the winter). When I heard the price I got another 140gal from my friend with a bulk tank and transferred it. My guess is I will use 800+gal this year.
On the natural gas, I got a lead on a retired state inspector in the next county over who's job was inspecting gas wells so I'm going to see if I can pick his brain on private well development. Thanks for all of the info.
Bob