I have same unit/same year...what have the temps been there ?
We've been in the teens at night the past few nights, but no problems at all...yet ! Our furnace runs very little, but I make sure it runs pretty regular...about every 1/2 hour it kicks on.
I haven't skirted yet, and unless I run into problems I don't intend to.
Even tho' we get pretty cold at night, every day is above freezing and with full sunshine we even have to open windows and vents sometimes during the day....maybe your problem is the partially the extended time under freezing temps?
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