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The electric heaters in G1 and G14 are controlled by Sonoff devices over the network. Room temperature is acquired by an ESP8266 room sensor, the thermostat is a python script at carbon:/srv/docker/py3scripts/scripts/thermostat.
Target temperature can be changed by mqtt messages, which can be sent by the control panel in G1, or by your computer.
There is also central heating from Summerhall in G1, which is switched on rarely. It is hidden in the panels above the windows. It can by adjusted with the knobs.