I have a 2005 bus. Only two slide instead of 4 but I believe the wet bay and everything is in the same place. The rear furnace blows into the wet bay area which has the tanks, the water pump, etc. I bought an atomic clock with indoor outdoor temp readings and put the outdoor sensing unit in the wet bay and constantly monitor the temp in there. I spent the winter last winter in Bartlesville, Ok and saw several below zero days with 6 below being the coldest. We were heating with electric heaters in order to not have to go get propane every week. I bought the smallest electric heater with a manual thermostat ( not digital) I could find at walmart. It was a small cube and was only 750 watts. I put that in the wet bay and ran an extension cord to the shore power 115 vac receptacle in with the breakers. I put this heater thermostat pretty well close to the lowest setting and kept it 50 degrees in there all winter. I moved the bus once to go get propane and put this heater in storage while i was moving. When i hooked it back up i hit the thermostat while i was putting it in place. I noticed later that evening the temp was 115 degrees in the wet bay area. That small electric heater had more than enough power to heat that area up like I said in -6 degrees.
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