Originally Posted by coachtcardoso
We just got back from our maiden voyage. 3 nights with hookups to water, power and cable. The AC ran great and cooled is down after a hot hike.
The furnace has me thinking. When on, I get a lot of cooler air dumping out of the Dometic AC/fan while the hotter air comes up from the vents down by the floor. Should the furnace mode have air coming out of the "AC unit" as well as the floor? I didn't think it should and thought maybe it was air intake. It was just air out (fan mode).
You didn't specify the model of your TT, but this sounds a bit like my 2016 Jay Feather 23RLSW. You can run the A/C's *fan* unit on "Auto", "Lo", or "Hi", and then switch the thermostat to either A/C or Furnace. When I set my fan to Auto and turn on my furnace, *SOMETIMES* the A/C's fan (not the A/C compressor, just the fan) comes on. It pulls the newly heated air from the TT cabin and circulates it throughout, thus distributing the warm air.
The furnace and the A/C's circulator fan in my TT have no direct connection - they're physically independent of each other.
But what really has me puzzled is the *sometimes* when the A/C fan kicks in along with the furnace, maybe 1 out of 5 times the furnace runs. This has me baffled; I would expect it to run every time, or never. Not just sometimes, or when it feels like it.
Anyway, your unit may be different than mine. So the answer is, "it depends". Don't you love those?