It is about -20 F and feels like -34 (according to the weather channel) and I have two small children getting cold!

I called the Tin Shop and the guy was booked. I explained my problem, and he said "sounds like a condensate drainage issue". So, I was trying to figure it out. My furnace has a PEX line running into the concrete floor in the basement, and it LOOKED like it might have been backed up with water. So checking on my system, it looks like I can just cut the PEX. as seen in the picture. I had to blow on the pipe to clear it out and I think there was fungal/bacterial buildup. I poured a bit of bleach into the pipe to help prevent future buildup. Then I just removed the remaining pex from the fixture and refit the pipe back on. Since there is no pressure in this system I don't even need a new fitting, just left the pex attached. Furnace fired right up and house warmed right up!!