myredracer wrote:
The bedroom's flexible duct could be 2" and the rest of the interior ones 4". A smaller duct has a significantly lower CFM output. If you could get to the duct, you could upgrade it to 4" providing it does not impact the furnace specs. as far as CFM goes.
The specs. for your TT say that the underbelly is enclosed so you can't do anything with the duct unless taking down the coroplast which is not a quick job.
We have a 4" duct to our living space which goes under the floor and comes back up. The air output is considerably cooler in colder weather compared to the other grilles. I may pull the duct out and insulate it without removing the underbelly as it's a short enough run to pull out. If your bedroom duct is 4", insulating it could be an option but getting to it might be the problem with that idea.
Heated underbellies are extremely inefficient. The air ends up going outdoors and can leave the inside shortchanged. We don't camp in cold weather when it can get below freezing so I actually blanked off the ducts into the underbelly but have not had a chance to try it out. (I also upped one interior duct from 2" to 4" so the air flow is still relatively balanced the same.) One problem doing that is that the floor can feel uncomfortably cold. We have converted to 100% electric heat and don't use the furnace anymore but have found that the floor does feel cold and we need to wear slippers.
It is a 2" duct for sure. I've inspected every place I can without removing the coroplast. For this trip I may just use my electric space heater to knock the chill off the bedroom. I'm not looking to tackle that coroplast right now. Sounds like no fun!!