More crazy Oklahoma weather is ahead for us in April. Weather forecast is for three nights in a row with below freezing temps. Daytime temps. will be in mid-40s. Tonight and tomorrow night's low predicted for 30 degrees and the third night will be 28. After that it warms up a lot. My question is this: will it help prevent damage by running heater in motorhome. Our motorhome has been de-winterized and we recently returned from a short camping trip. It is currently parked in our driveway where we can run electricity to it. We rent covered space for it, but there is no electricity.
I use a thermo cube connected to an electric heater. The Thermo Cube is a Thermostatically Controlled Double Outlet that plugs into any of your 120 outlets - it will turn on your electric heater when the temp gets close to freezing. Inexpensive way to protect your rig.
For many years I would winter camp in my RV in very cold temps and would simply wrap certain parts 'exposed' to below freezing temps.
I mostly agree with others , elec heat cant hurt but for the most part you should be ok at the temps you have described .
Some plastic fittings and valves are the first to crack depending where they are located. Example: my water pump and valves are located inside an exterior baggage compartment but its enclosed inside a heated box , heated by a direct duct off the furnace. If you have a setup like that, then you might want to run the furnace to be sure or wrap it in a heavy towel.
Keep an eye on exposed low point drain petcocks if they are exposed. If so, you could simply wrap them with something to insulated them. You have to keep the direct wind off them.
Place a bottle of water on the counter next to an outside wall and keep an eye on it. If you see it begin to freeze, turn on the furnace heat.
28 will be fine. Do run a heater and open the bottom cupboard doors.
Regards, Don My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.