How loud are these generators?

55 to 65 decibels, which is dishwasher volume. Kohler is the quietest of the four brands by a few decibels, which is the reason it’s a common choice in Highland Park and other neighborhoods with strict noise rules. The weekly self test runs 5 to 10 minutes, normally during business hours. During a real outage, the whole street is dark anyway and the generator humming next door is the least of anyone’s complaints.