I think the biggest thing you need to know is how much power does the furnace need to start???
How long will the generator operate at any given time....
As I am sure you are aware there are generators and generators..
If you are using one for short burst duration one purchased at one of the large hardware operations will work fine....Many of the construction people purchase them and run the you know what out of them day after day.
But most of those unites have little more than a inexpensive gasoline engine and over a long period of time they will fail when you need them the most....
Again depending on how you will use the unit the engine is a very important part of longevity but it also is a great cost differential. I highly recommend electric start pulling the high horsepower engines can give you a heart attack. 220 output 30amp receptical make sure you get a ground bar to bury next to the unit....you can put a standard surge protector between your hot lead and the furnce if you are afaid of a surge...but not knowing the furnace your bigestproblem is the initial power needed for the start-up...once running the furnace should not pull that much power

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