[thenewkid64]

The forced air furnaces do use more propane than the catalytic heaters do. But the forced air furnaces are also keeping you and the the holding tanks warm as well as the furniture. The catalytic heaters are best used in cool weather 35-50 degrees to take the chill off, or if you are boondocking. The forced air furnace will be necessary if the temps drop much bleow that to keep you warm and cozy. propane usage is an isue, but that is why you have 2 tanks. If you run out in the middle of the night the auto switch does it's thing and in the next day or two you can pull the empty and get it refilled.

I just figure that propane is a cost of having my "house" with me wherever I go. You need to decide for yourself if the usage is high or not.