I have had my Seneca out in temperatures in the mid-20s and it did fine. The floor still felt cold on the bare feet, but it is the same felling I get in my stick house on tile floors when not wearing my bunny slippers! The air discharged from my registers is quite warm and my bathroom gets so hot I have to block most of the floor register in there.
If CW is not addressing your issue you might try calling Jayco Customer Service, be persistent and try to get them to allow you to have it checked somewhere else.
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST