Cold temp question....just in case

I’m glad that it worked for you!

*** UPDATE ***
I ran the furnace at 45 degrees with all the faucets and cabinet doors open. I placed a portable thermometer in a closed off access area where water lines ran (under bathroom but accessed through the outdoor storage compartment). The outdoor temp at 7am was 24. The temp in the living room was 45, and the portable thermometer read 44.5.

Science experience completed. One more night of cold temps tonight before a warm up in the midwest. Thanks for all the feedback.

Brian

I dunno about Illinois, but we haven't had any warm daytime highs in my area for the past 48 hours... been below freezing the entire time.

ps oh when will it end!

I agree with Todd.

I, however, would not have drained the water heater and it would be turned on.

Just my opinion here,if you have forced air heat to your basement ( tanks, plumbing, ect.) area....you should be fine! Likely the lows in the mid 20’s will only be a small % of the 24 hour period! The RV should be like “heat sink”, absorbing the warm daytime highs, and slowly lose temperatures as the ambient temperatures lower. “IF” a water line is exposed or running in contact with frame directly exposed to ambient temps.....All bets are off!

WrightOn,

This can depend on how your furnace circulates air. Mine pulls air out of the trailer into the under-belly where the tanks and water heater are. (I think this is the basis for the manufacturer's claim of "heated tanks".) I have set the furnace at 40 and left the water heater on for mid-20's nights (our lowest temps are usually just a couple of hours) without any freeze damage. But make sure you have enough gas because the furnace might also run during the day or any time that the temperature is below 40.

JRMunn

IMO you are good. We have had mid 20's some nights when our trailer was not winterized. I did what you have done and it was fine. Make sure all cabinet doors and inside doors are open.

All depends on how many water lines run thru unheated areas.

I'd aim at 50 F for the furnace.

Not a risk I'd take, if your location is Illinois. 40 degree at the thermostat could see 10-15 degrees colder inside the walls and cabinetry. If you get 20s all night long, could be a problem.