Folks, I want to install a standby generator powered by CNG. Any thoughts? I have 2 AC units but really only need to run one during an outage. Otherwise I got the standards stuff like 2 fridges, electric range. I think minimum to run my house is 20KW. I wouldn't mind finding something used and bumping up the KW.
The only consideration is that I want it to be quiet. I used to have a portable generator for some of the house but the neighbor would call at 10PM on the dot

saying it was too loud. Ok maybe he was right! Now I just want something quiet. My neighbor has a 84KW with a Chevy 350 running it but that is to literally power everything. For my house I think hers would make excess power. The thing is, the 350 runs at 1800RPM to make her power and you can't even really hear it.
So what do you have or what does your company install? Note: don't NEED an automatic transfer switch but it would be cool.