The transfer switch has multiple switches that allows me to power different sections of the house. I tested everything running the generator - the furnace, the fridges, select lights - it works like a charm. The generator runs off propane and I have 8 bottles of extra in the shed in addition to the large tanks in the camper. Propane is very stable in long-term storage so it is my ideal fuel.
My point being that I don't know where the cost of a home generator is between 7k and 15k. Even if I purchased a separate generator dedicated to house back-up this would be around 2k. The transfer switch would be around 1k for the average consumer. That is 3k. What am I missing about these estimates?