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[Ridgekid]

Yeah it is. Just turn your thermostat down for the heat pump. It should not come on. This way the sump heater on the compressor will stay on too.

[RSI]

I have a 10kW Generac with Automatic Transfer Switch.  RSI mentioned something about relays which im interested in but I dont have schematics and dont know what components to use.  I would simply like to wire the furnace fan separate from the electric grid in the furnace.

I forgot about that.
see if you have a schematic of your system and post a picture (or email) of it. It is usually located on the back of a cover.

[oldchenowth]

Going back to Ridges post, he's right always turn off your main but I put a light on my meter side of the main so when the power comes back on the light pops on and I can turn off the genny.  Put it on a pull chain somewhere it is easy to see and turn the light off when normal power is on.  Yes, I know it is unfused.  But, most if not all, on here are competent enough to be careful when wiring something like this.  My neighbors usually watch when I shut mine off so I guess I am the test monkey.