i installed inside-outside temp gauges from harbor freight in the water compartments. i use 2 or 3 electric heaters most of the time inside the moho when plugged in to shore power. when using the inside electric heaters, i found that the water service compartment is the only one that needs supplementary heat when temps are below freezing. i use a drop cord light with a 100w bulb for this purpose. it is necessary to keep the water heater on, either gas or electric, or use another drop cord light. when using the propane furnace, no supplementary heat is necessary down to approx. 20 degrees. i have not seen it colder than that in my neck of the woods yet.
01 WINNEBAGO 35U W20.8.1L SW Wa, Hi. Good Sam, SKP. AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '14 smart car