Did you have the tstat on electric heat or gas?
When our heat pumps quite due to cold temps, and gas comes on, the unit compressor will turn off, but the fan will keep running. Dumb, I know, but talks with both RVP and Winnebago confirm this is the way it works.
But, if you have it on gas heat, then it should not work that way.
Dan & Sharon & Kasey (Our Yorkie Puppy (12 Yrs Old) On the Road (2012 Journey 36M, 2006 Jeep Liberty)
USN-Ret ('65-'93) Fulltimers, Class of 2012