Something I learned from a friend with a hoop greenhouse. If you run a line of the small Xmas lights along the top, it will heat things just enough to melt the snow that is right against the plastic, allowing it to fall off. I don't have to worry so much about that, as the material is very strong. (see the pic) It looks a little like cardboard in the construction.

Have you read the book Four Season Harvest by Eliot Coleman? I love his ideas on how to use a greenhouse without all the expense and fuss of heating it- using smaller hoop tunnels and such inside for more insulation.
Anyway. The promised snow fell... and fell... and fell. We got about 18 inches, and there's more snow coming tomorrow. My snow boots are not tall enough, and I don't have any snow pants so I have to change into dry pants each time I come inside as it's over my knees. I hang the wet pants and boots in front of the fire to hopefully dry out before the next foray.
Currently it's 3F degrees out there, and even Millie with her long coat doesn't want to be out there. The ducks are only coming out of the coop when I tempt them with warm water.
I've had the oven going today too- Pumpkin Pie, and baked pork chops in marinara to go over pasta. Winter Salad on the side (half grated carrots, half grated cabbage, with a vinaigrette). We've been eating leftovers for a few days, because I made a monstrous casserole of Ham with Macaroni and Cheese, and then Crockpot Pulled Pork, and then a stir fry of shrimp and asparagus with pasta and a light cream sauce. All very good, but I made too much of them. We still have some of the shrimp and asparagus, but I was tired of leftovers, lol.