cannuck
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We have one HUGE building at the farm that is 100% off grid and our corporate cabin on a mountain top is not only all off-grid, but 100% on line. I am still a rank amateur at this, but some day if I ever manage to make enough money, I would like to build my last home similar to what you have: active solar heat supplementing ground heat pump, wind for basic power and grid when no wind - maybe some solar to support summer cooling (but fully designed as passive solar with massive heat sinks). Not pretending that would be cheap, but...well, you know why I would do it. My business partner down in WY built a house for his sister that has extremely effective passive solar heat and passive natural vent for cooling (in ground pipe in gulley gives cool air that circulates up and out through opening ridge windows that are for solar in summer). Also a semi-underground home (Northern exposure). Near zero carbon footprint in operation (does have natural gas for makeup heat, electric for lighting - does NOT need any a/c).Yep, and with hybrid electrical systems like mine, people can use on-site solar power when the sun is shining and use grid power when its not, cutting the usage of grid power significantly.
It just takes a little thinking and a lot of work or a fair chunk of change if you can't swing the former two.