Electric Heat

I find the Crane to be quieter, but again no thermostat.
So, if the on/off cycling of a thermostat controlled heater will wake you, maybe the Crane would be better (just crack open a window if it gets too warm).

Like most on here we discovered the factory furnace did a good job of heating the pod, but during the night the noise woke us up, I guess you could get used to it , but no thank. We bought a Holmes 1500 watt electric heater, it has an adjustable thermostat, blower with or without heat, it has an oscillation setting if you like that function. We have camped when it was down into the mid 20's and the Pod had a hard frost on it in the morning. The Pod stayed a constant 73 and the little heater only came on every 15 minutes or so and was so quiet it did not wake us. We have a 172 and set the heater on the bunk end of the Pod and sleep in the short queen. It keeps the pod toasty. We use it during the day if its cool outside and only use the gas furnace when its cooler and we are setting up to warm up the interior initially.

Seems like the gas furnace contributes more moisture to the inside, whereas an electric heater dries the air out. I'm sure somebody here can explain it better...

Neither affects the moisture levels.  Both just recirculate the air inside.  The combustion gases from the flame on the furnace are routed entirely outside.

On our first colder weather camp out we did not understand how tight the pod was and when we got up in the morning the inside of the windows were dripping water and running down the walls. Like others have posted we usually leave the shower vent cap cracked and or just barley crack open one window and use the 1500 watt Holmes heater, it cycles on and off and moisture problems are a thing of the past.