You know the old saying you get what you pay for. If you want a quiet generator you have to spend the extra money and buy a Honda generator.
Besides being a good generator they seem to be more quiet then the other brands which are cheaper. My first generator was a Honda 2200 watt I bought in 1983. It still works as good as it did back in 1983. And their is no telling how many hours are on it. I bought it to run my roof air in my cab over camper I bought. I had the cabover for 23 years. Right now I have a champion in my truck bed to run one 15,000btu coleman ac on my 5th wheel. It is not as quiet as my Honda. I also have a bigger Firman generator for power outages at the house when a Hurricane comes in or the power company wants to cut my electricity off during a freeze like they did in 2021. None is as quiet as the Honda.