You'll be glad you did it.
I got sick and tired of the crap service of Larry, Moe and Curly's rural electric co-op where I'm at. Power has been going out 1-4 times a week for no particular reason here for 20 years. THEN there's the weather related outages...…… So, when we moved into our new place, one of the TOP priorities was backup power. We installed a 16KW Generac natural gas unit on a 200A ATS. Now...……….when the power goes out, you count to 5 and the Generac is up and running automatically and we can give the electric company the bird.
The 16KW runs EVERYTHING in a 3150 sq/ft house EXCEPT...……………..in the summertime, if the central A/C units are BOTH running when the power goes out, the generator won't roll them both over while they're still at full capacity on the compressor side. I think it's as simple as putting a couple minutes of staggered start-up time on the units so when the generator kicks on, the A/C units get a couple minutes to "decompress" before they start up again.