StubbyieContinuing the conversation.
Also for consideration is how your place is heated. Summer is hard but survivable. Winter can be tough. If you've got electric resistance heating or heat pump you need more power, lots more power. 'Emergency' heat on your heat pump supplemental strip heaters can easily use up 10-Kw. If you're on oil and you only need a pump and blower, different story.
Great information, I agree with everything and only have a couple of questions. I have two heat pumps and electric resistance for when it gets cold. My heat pumps are inverter type with a lot of electronic pc board control. I have not powered the heat pumps from the generator as I am concerned about the electronics, do you have any experience? As for heat when the power is out I use my back up propane furnace as it supplies heat at about 80% efficiency versus the generator supplying electricity at 30% efficiency. The propane should last longer with the furnace and I don't have enough generator to pick up all the electric heat if its below zero. If I put in another switch to power the heat pumps they should beat the furnace at least for moderate temperatures.