A quiet compressor?

toolmanmike said

Don't box them in. Don't enclose them. Look at the compressor heads. They have cooling fins for a reason. If you box them in they get very hot, can damage the compressor and the electric motor (which gets very hot as well) and heat creates moisture. You don;t want that in your air lines.

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Heat does not "create" moisture, it is already there. But it can keep the humidity vaporized and send it down the outlet instead of condensing it in the tank.

But you SHOULD be able to build an enclosure that is vented, all you need "at least" is how it's done for combustion air---grills down low and grills up high, that create a "chimney effect" to flow air up and out. "At the worst" you might have to have a high mounted exhaust fan to encourage a stronger draft. Insulate the enclosure, and choose an area to reflect the noise away from the shop area "out back" so to speak.

But the BEST is the old school cast iron belt drive "slow" pump. some of those old girls--even a 10 hp 3 phase---you can stand there and hold a conversation, "at least when I was young" and could hear!!