In 1920, W.R. announced that his second son, Charles "C.B." Sweatt would be the advertising manager and treasurer of the Minneapolis Heat Regulator Co. At this time, there were 250 employees in the home office and factory with 100 more in sales and distribution throughout the country. By 1926, there were branch offices in 9 cities, complemented by 15 authorized distributors. The control system ranged in cost from $60 to $180, which might include a clock thermostat, a limit control (which provided a safety valve to prevent accidental overheating) and a damper motor.