pianotuna wrote:
Hi,
I've tested this down to -27 c (-16.6 f). It allows me to heat 100% electrically, but could also be used with the propane furnace, to keep things warm between furnace burns.
Replace the return air grill on the furnace with a fan. On my rv that circulates warm "living space" air under the cabinets and pushes some air along the furnace duct work. I chose to use a dual window fan unit which is controlled by a mechanical thermostat that lives beside the water pump next to the outside wall of the RV.
The fan unit draws just 23 watts and works better than a 1500 watt fan based heater which I tried using inside the cabinet.
