I do the same for below freezing nights. 62 to 64 on electric fire and 66 to 67 on the furnace. The furnace works so good that the electric fire pretty much is off this keeping the water bay and underbelly nice and warm.

One tip for peace of mind…. I have 3 remote wireless temperature sensors with a nice readout on the RV. I put one outside, one in the wet bay, and one in the outdoor kitchen. Also, my rig has tank heaters on the holding tanks. I turn them on as well.

Kalawen Weather Stations Wireless Indoor Outdoor Weather Station, Home Weather Station Multiple Sensors with Atomic Clock, Indoor Outdoor Humidity Thermometer Monitor Digital Forecast Weather Stations https://a.co/d/5Jh4GEX