Yes, LM. I have a hoop coop now. It's actually a very nice one (8 x 12). A bit of pride here... I put a loft in the back half (4 x 8), with styrofoam insulation covered with corrugated plastic roofing on the outside, and fiberglass panel on the inside... the stuff they use in milking rooms (I think). 1/2" hdw. cloth skirt and over all except for the loft. End panels of the loft are also plywood styrofoam sandwich. Outside nest boxes, 2 roosts. But my flock of 17 will definitely not do well there this winter.
So, the plans are in the works for an 10 x 12 stick built. I scavenged some beautiful Anderson and Pella thermopane windows and door from the dump. It will have metal roof, T-1-11 siding, 2'h x 4'w clean out door at one end, outside access nest boxes, small outside access storage closet for feed and supplies. hoping to figure out the automatic pop door on a timer using a car radio antenna and motor. Also planning to have a broody cage/jail above the nest boxes. Very basic electric access.
Yes, I agree that snow is an excellent insulator. But, with so much of it, by the time I got it moved off the top, it was 4' deep at the sides, (and when the next storm came around, I wouldn't be able to get close enough to get the snow off it!) All that snow against the sides didn't allow any light into the interior of the sun room... so if I wanted them to get that solar gain, it meant shoveling... Yet an other reason for wanting to build a bigger and sturdier coop. BTW: I didn't have a single frozen egg last winter! In spite of temps to -20 for days on end.