I would consider getting one big enough for everything. I moved into a house with full generator already set up (22kw). I have a 5k sq ft house, 3 ac units, large garage. I’m in Houston area and we have had it come in big time twice now in the last 8 months. I had to replace the battery this summer (right before outages) but that was easy. I had annual service in October and for some reason, all the service lights were flashing last week. Manual reset cleared it out and we haven’t had any problems this week. It has run probably 30 hours with no problems this week. Last summer it ran for 3 or 4 days. One day it got overloaded because my wife was doing laundry, had the dishwasher running, and all ac units were full blast. Turned some things off and reset it. No problem. Last, mine is really quiet. Lady across the street just got one installed last spring and I can hear hers (in her backyard) more than I hear mine (around the back of my garage). Power goes out, 15 second count, generator starts, another second and lights come back on. It sounds like a VW bug starting up, then just hums along.