This is currently my aunt's house. It's been in our family for a couple hundred years. When I was a kid, it was the best place I ever found for getting huge icicles. If you look closely at this picture taken the other day, there's one there on the front porch that's about 7 feet long.
Clearly it needs some more insulation, but the thing that interests me is that the longest icicles are at the front porch. The space above the front porch is unheated. That whole second story above the front porch, with the three small windows, is unheated attic. And to the right of the windows on the first floor on the actual front porch is an unheated pantry and stairway leading to the attic. So I don't know why it's melting so much. Those windows into the house on the front porch itself go into the heated dining room, but everything around the dining room is unheated.
It's curious to me. I do know it's a very old house with not much insulation, if any. It's really pretty in this picture.