It makes a huge difference, doesn't it! Our house was built in 1925 and has next to no insulation. Two weeks ago my wife and I blew in 42 bags into the attic and above the rafters. We were short on time and ran out of bags with two sets of rafters left, so we decided to let it go since we hopefully have already made a big difference. You can spot the two rafters that lack frost every morning!
