Hello, Don't know your whole set up there but do you happen to have a 'fresh air intake" bringing in fresh air from outside? If so, with a drop in the cold temps you've been having there that cold air entering and hitting your warm air will condense much more. This crazy weather has a lot of us thinking over time these days. Humidity level in your home? Too much moisture in the air will bring that cold air back to your warm furnance and produce more condensation as well. Check humidity level, they say around 30% is all you want. We actually use a "swing gauge" this is on a string and you swing it around inside your home and it gives you a very good reading on humidity. Humidity in our homes create a lot more issues then people realizes, colds, allergies, window sweating, mold etc. Good Luck, hope this makes sense.