Mark C. Honeywell
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Early years and marriage
Honeywell spent his childhood growing up in Wabash, Indiana, and in Florida. He held various jobs in his younger years, including working in the citrus and bicycle business, and in his father’s Wabash mill. He graduated from Eastman Business College in Poughkeepsie, New York, in 1891.
Mark Honeywell was married twice. His first wife, Olive May Lutz, whom he married in 1899, died in 1939 as the result of a fall while on a boating excursion in Florida. In 1942 Mark married Eugenia (Hubbard) Nixon, the widow of Don Morrison Nixon, a newspaperman from Wabash, Indiana. Eugenia Honeywell died in Wabash February 8, 1974 in a house fire. Though originally believed to have been a faulty thermostat, the Wabash fire investigator said that there was no valve malfunction. In the Wabash Plain Dealer newspaper, fire chief Jack Saril said, “We have not been able to find any other possible causes in the area where we know it started.” 
Honeywell developed a hot water heating system, and by 1905 had installed the system in his house—thought to be the first in North America. The idea of hot water heating came from England. Radiators first came from England and molds were made from them in Wabash. His business, M.C. Honeywell Heating and Sanitary Work, became Honeywell Heating Specialties Company. By 1906 the company was making thermostats and automatic controls for heating systems.
By 1927, annual company sales were more than $1.5 million and 450 people worked in the Wabash factory. Honeywell's main competitor was W.R. Sweatt and his Minneapolis Heat Regulator Company. The two companies had patents which blocked each other from further growth. They merged to form the Minneapolis-Honeywell Regulator Company with Sweatt as Chairman and Honeywell as President.
- Rodengen, Jeffrey L. (1995). The Legend of Honeywell. Fort Lauderdale: Write Stuff Syndicate. ISBN 0-945903-25-1.
- Church, Roy (14 February 1974). "Decision Reversed". Wabash Plain Dealer.