Hi, As Robbie suggests, this outfit would likely be too loud for a
small organ.  The two motors have a sound level equal to two small
vacuum cleaners.  It's not as loud as some shop vacs.  The pressure
motor also heats the air to some degree.  I haven't measured the
temperature yet; it's warm but not hot.

The Tangley calliope is so loud indoors that the motor noise is not
much problem.  It's obvious between songs, though.

Bill Black