Abstract: The problem of adequate flexibility and reliability in apparatus for controlling temperatures in a plurality of zones is solved by a clock and digital logic circuits, together with a temperature sensing circuit portion effective in combination with platinum film-type temperature sensors, which produce effective sensing over a wide range of temperatures. The control apparatus automatically effects two temperature sets per twenty-four hour period for each zone with an optional temperature set for weekends for all zones and has a display of current time and a display of temperature for each zone.