5p5 wrote:
I HAVE LOOKED AT ALL THE ANSWERS ! and they were all the same,
pay more than I paid for the generator, about twice as much.
And calling all the electricians in the phone book I found that no
one will do anything by themselves. You must have a electrical
contractor to do anything and that would cost me about $2000.00.
I paid $ 600.00 for the generator, you do the math .
Thanks anyway !!

Ok, how does this sound: take the j-box that's presently servicing the
furnace and put a duplex receptacle in, or below it; or make it a
single (heck make it a GFI). Run a heavy-duty appliance cord (making
sure that it's rated for the amperage) from the furnace j-box and plug
the furnace in. Try to route the appliance cord in a workmanlike
manner (not a tripping hazard). When the power goes out, plug the
furnace into the generator (via an extension cord, since the generator
will probably be outside).

That'll work, but I bet it isn't code, and I expect some flames from
real electricians...soon...

Install a flanged inlet on the furnace and connect it to one end of a
double pole double throw center off switch. Connect the common terminals
of the two poles to the furnace equipment. Connect the other end of the
two poles to the furnace branch circuit from your service equipment.
Total materials less than $100.

If you have a modern electrical panel in use as your Service
Disconnecting Means then you can purchase the needed interlocks and
Inlet connections for less than two hundred dollars. Several hours
invested in reading "Wiring Simplified" and asking informed questions
will take care of the labor cost.
--
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous
for general use." Thomas Alva Edison