nice looking solar shack Verdigo.
I use passive climate control. Roxul between my joists (and a plan to put 1 or 1.5" polyiso sheets over the joists). I also insulated the floor (before finding out about floor insulation in "pole" barn style buildings). So glad I used pressure treated.
My walls are about R16-20 and my floor is around R25. I put an additional R10 under the batteries with xps.
We had quite a cold winter here this year with plenty of -20 C to -30 (as low as -15F). My batteries lowest recorded temp was -7 C (20F). I have better luck in the summer maintaining a pretty close to 25C average regardless of outside temps.
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