I have two duel fuel generators. One Firman and one Champion. When you run them on propane, they are not as efficient as being run on gasoline. But the propane doesn't go bad as fast as gasoline. The one for the house is a Champion 7300/8000 and runs a 2000 sq. foot house with everything running at the same time, no issues. The 7300 is if it's running on Propane. The 8000 watts is if it's running on gasoline. I had a Transfer Switch installed by a professional. He made me a custom "whip" ( a long custom made cord 75 feet long), helped me figure out how to make it "Floating Neutral" (You just unscrew a nut take off the lead and wrap it with tape). Otherwise the generator will not power your home. The long cord is because they are loud and I didn't want it too close to my house. I roll it out of the garage, hook up the whip and start it up. Throw the transfer switch and I am powered back up. I paid $2600 for the transfer switch and about $750 for the Champion generator about 5 years ago. The prices on the transfer switch has gone up a lot.
I have 3 at the cabin. Two Honda Generators and a Firman Inverter.
I researched the Generac, not for me. They have issues that I don't need or want in Alaska. Like the auto start each month, not for me. The switch to make it not do that is $400. No thanks. I need to be able to work on it myself. Nobody is showing up in Alaska for anything, your not getting any help, you better be able to fix the problem yourself. Hope you find a system that works for you in your area.