That means there s heat loss likely due to poor insulation and or ventilation in the attic.
If snow stays on roof does that mean good insulation.
The best snowstorm for these observations will.
The good news is that it is beautifully restored and from the 18th century but the bad news is the owner is paying to melt the snow on his roof.
If your attic insulation is good the snow will stay on for a long while and actually will add insulation to the roof since snow is an insulator.
This house is good news and bad news.
The snow is not affected by the heated house meaning that the attic floor is reasonably airtight and insulation is sufficient.