I recently made a sales call to an individual who built a man cave of sorts out of two containers. He paid a bit extra to purchase containers that were original

I recently made a sales call to an individual who built a man cave of sorts out of two containers. He paid a bit extra to purchase containers that were originally refrigerated. There was a fair bit of insulation sandwiched between two pieces of steel. It was quite impressive from an energy and noise standpoint. It was eerily quiet.