I think you'd need to make use of multiple renewable sources (solar, possibly micro hydro, if your site had a little wind) plus the propane tank option. The challenge in my mind is the peak heat periods. You could mitigate this problem by using a whole-house attic fan (I grew up on an attic fan, and still miss it) and then only cooling very small targeted areas of the house for the short periods of time you really had to have it. Like efficient mini splits into a small bedroom. The battery situation would need to be very well thought out. I think you would be good on heating, especially in your line of work. Burn baby burn on the wood.