Unlike most other cold plunges on our record, which use ice or an external chiller, the Sunlight Dwelling Plunge Professional has an integrated chiller that cools water up to twenty-eight degrees Fahrenheit (the bottom on our listing). It is a minimal detail, but we love the way it simplifies setup, https://www.evernote.com/shard/s697/sh/a9acd258-20b5-6890-992b-777bce8e0968/lJ28wPfwQbU5gBEgw3Z9Vv_aRTIpsdAHoA6MjV4YdbsAdE1R4T-FkREkyw