well thats what i have on about the same square footage house with all electical appaliances.. you have to figure in for starting amps.. you cant figure if you house pulls 100 amps that you can get a gen. that will pull 100 amps.. it has to be alittle over rated—(example) cause like your air condition will pull alot more amps when it first starts then when its running after it starts.. so thats why you have to over rate it alittle.. you can put a amp probe on @ the main 220 and see you amps with all items on in your house. that will decide the KW needed— well, i own a generator rewinding shop, build generator packages for offshore use, i’m a electrician,ect.