Abstract: An electromechanical analog or digital system that controls a steam heating cycle in one or more spaces is revealed herein. Said electromechanical system is comprised of pressure and temperature sensors, and pressure and temperature switches. Said sensors are installed into or onto a steam heating system, at the furthest steam circulation point physically accessible of said steam heating system. Said switches, by either mechanical or electrical means, receive temperature and pressure data from said sensors, respectively. Pressure and temperature switches are interposed between a thermostat and steam supply, as to oscillate steam supply until pressure and temperature set points of switches are achieved or set point of thermostat is achieved. The same aforementioned system can be controlled using a digital controller to take pressure and temperature sensors information into a controller that will interrupt or continue the call for heat from a thermostat to a steam supply.