Thanks BBP - I looked up his posts which led to a long line of sites with underground insulated storage - I think what I carry away is that what heat you keep would be small in relation to the effort! Still can't see how the math works for the Alberta site but back to a smaller in basement tank to act as a daytime flywheel for the solar and geo. heat pump.
The hvac stuff is new to me - I'm in the process of learning to braze up my first pipe joint in a starter ex-window unit geo dwh and evacuate it.
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