: Inverter generators are generally much quieter because they use advanced electronics and are typically housed in fully enclosed, sound-dampening cases.

: Many models include internal anti-vibration pads to isolate the engine from the frame, preventing structural vibration from turning into audible noise. Ways to Reduce Noise During Operation

If your current unit is too loud, you can employ these strategies:

5 Best quiet generators (With noise levels) - PowerOutage.us