You need to buy a transfer switch. Your electrician can guide you from there. Is your heat electric or fossil fuel? How many BTUs? If electric, it will draw much more from the generator. Hire an electrician who has installed generators many times. What’s your fuel source for the generator?
My house is all electric at about 1750sqft. This is a dual fuel generator. Propane/gasoline.
How many BTUs?
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Old Hee Haw joke:
Enough BTUs to cool a BUT as big as a TUB.
YES...TRANSFER SWITCH IS IMPERATIVE.
Connects your generator to your home circuits.