Install underfloor heating in the attic and then melt the snow off the roof. It's easier to melt it than move it, and melting it will probably move it at the s

Install underfloor heating in the attic and then melt the snow off the roof. It's easier to melt it than move it, and melting it will probably move it at the same time (it will slide off the roof pretty quickly if the bottom layer is liquid). If you want to include a programming aspect, build a basic depth monitor (light beam detector a certain height above the roof) to trigger turning on the under-roof heating to start the melting. This would spare you the electric bill for light snow flurries that you wouldn't bother to shift.