Originally Posted by VinceU
Try to set thermostat on "heat" and fan on "auto". The heater should work by itself. The Fan is really a HVAC fan for circulating both A/C air as well as circulate heater air. It only works on 120VAC. The furnace and its internal fan operate on 12VDC
I haven't really had a chance to try this yet. Although, I think there might be something to this. Right now, the temp here is 90+ so testing a furnace is kind of difficult. I'm looking into the issue right now because I'm considering some trips up into high country where I know early morning temps will be cool. The campsites up there are mostly primitive with NO hookups. I know the generator would work, but I also don't want to run the generator early in the morning to not disturb others.
When I had used the furnace, AC or heat pump earlier, I had always noticed that the "FAN" came on. This FAN is the one that blows air out the overhead vents. So, I assumed this is the only fan (besides the fantastic one). I didn't that maybe the furnace might have its own ? The overhead vents did still blow when the furnace was on, but I think I never actually had the FAN control set to Auto, only Low..
I do notice a couple of vents down low. I'm not sure if these are furnace vents or simply return air vents ? Anyone know ?