Unlike most other cold plunges on our list, which use ice or an external chiller, the Sun Home Plunge Pro has an built-in chiller that cools water up to twenty-eight degrees Fahrenheit (the bottom on our listing). It's a small thing, but we like how it simplifies setup, and it http://www.servicezz.com/directory/listingdisplay.aspx?lid=39269#.Y-C0v3a9thE