Eskimo
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From a 2012 article before the Packers - Giants playoff game:
According to The Times, the ground at Lambeau Field has been heated since 1967 when the franchise installed electric coils underneath the playing surface to keep the ground soft in frigid conditions. The only reason "The Ice Bowl" -- the 1967 NFL Championship game between thePackers and the Dallas Cowboys -- occurred was because the sub-zero temperatures overwhelmed the recently installed heating system.
In 1997, the Packers replaced the coil system with a series of underground pipes filled with a solution that included antifreeze. The Times reported the temperature of the field is controlled by field manager Allen Johnson. Temperatures are expected to be in the 20s during Sunday's divisional round playoff game against the New York Giants, but the newspaper reported the field should read at a comfortable 40 degrees.
That's a lot like indoor radiant floor heating that some people do up here instead of furnaces. It makes for a comfortable basement.