Moisture in the Yurt from Condensation

[TKOAK]

We live in Big Lake Alaska and it was -13F last week. Last (2014) Thanksgiving is was -29F. We do not have a condensation problem. I have been reading and wondering why. It just dawned on me, that our yurt has Sunbrella fabric as the outside walls. We have a 18 oz vinyl roof. Pella windows and a 4 ft acrylic dome. We heat with wood and oil toyo stove. Standard house door. NO Condensation.
I think the sunbrella Marine fabric breathes. Our insulation is 1/4 inch this solar Guard by BP Solar. The roof has a 1 inch polyester blanket over the Solar guard. (reinforced vinyl, 1/4 inch fiberglas, and layer of pure aluminum)

We have had a problem with the Honda eu300is freezing. I made a blanket of Solar Guard and it now keeps itself warm.