Andrew L. Freeman was born in Upham, North Dakota. He attended the University of North Dakota in Grand Forks, North Dakota, where he majored in electrical engineering. He served as General Manager of Minnkota Power Cooperative from 1940 to 1982. Since 2004, Minnkota Power Cooperative, Inc. has sponsored the Andrew Freeman Design Innovation Competition at the University of North Dakota College of Engineering and Mines. 
Freeman first developed a block heater around 1947, and received U.S. Patent #2487326 on 8 November 1949.  In 1947, Freeman co-founded and served as President of Five Star Manufacturing Company of East Grand Forks, MN to manufacture headbolt heaters. 
- "Andrew L. Freeman". findagrave. Retrieved August 9, 2015.
- "Headbolt Heater". University of Nebraska–Lincoln. Retrieved August 9, 2015.
- "Andrew Freeman Design Innovation Competition". University of North Dakota. May 9, 2014. Retrieved August 9, 2015.
- US patent 2487326, A. L. Freeman, "Electric Internal-Combustion Engine Head Bolt Heater", issued 1949-11-08
- "Headbolt Heaters". Prairie Public Radio. 16 February 2004. Retrieved August 9, 2015.
- "Andrew Freeman helped provide power to N.D.". Bismarck Tribune. September 18, 2011. Retrieved August 9, 2015.
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