Hello everyone. New member here and I'm from Michigan. Our house is a 1.5 story house. The rooms in the upstairs are attic rooms or rooms with knee walls. I re insulated our attic last year and it helped quite a bit on keeping the upstairs warmer in the winter. On one particular side of my house I have really bad ice damns. I know that my attic and roof on that side isn't ventilated very good. Our first good snowfall came pretty early to me. I meant to do a lot of stuff before that got here but didn't get the chance to. Anyway I bought a roof de icing cable to try and help with the ice damning problem until spring gets here to try and fix the issue for good. My gutters are completely frozen and I now have ice damns up as far as I could reach with my roof rake. Probably about 6-8 foot up the roof from the gutters. Well I didn't realize that the roof de icing cable recommends not using an extension cord until I got home. My question is I have a big heavy duty 100ft 12/3 extension cord and I was wanting to know if that would be sufficient enough to run the cable for a few hours a day or not. The cord would be plugged into a protected strip in my garage. This is my only option as of right now. I didn't think this would be an issue but at the same time don't really know for sure. The protected outlet is on a 15 amp breaker.