Cold weather

I have a 2015 Vista 36y. I was able to install a small 12 volt computer fan in the hole between my 'wetbay' and the compartment under my bed where the warm air was 'supposed' to filter down to the bay from. This did not happen in sufficient quantity and I had a minor freeze-up because of it in 10 degree weather (yes, we were warm inside!). The fan cured the problem. It uses very little power and is noiseless. I just wired it into the circuit for the light in the bay on the hot side so anytime I have the house battery system on, it is powered. It's rated about .5 watt so I'm not concerned about it running the batteries down. It might take some creative peering with a flashlight and mirror-on-a-stick to determine where Winnebago engineered the warm air supply but once you locate it I think you'll find the fan a good solution. Those little things have gotten to the point that they will run for years non-stop on a computer without attention so I'd expect very long life in an RV situation. Something to keep in mind..if you opt to supplement your heating with some sort of small electric unit to save propane, they may not provide enough warm air to the spots that supply the wetbay areas. I see your floor plan has the bed on the opposite side from ours so yours may have a hole under your dresser area that's supposed to supply warmth to the bay.... I'm assuming that if you are camping in very cold weather, you already are hip to plug-in heated water hoses..