yesterday, the ecological nightmare happened to me. I opened the window in the early morning to ventilate my bedroom and got a business call at the same time… distracted by the work i forgot to close the window and didn’t turn down the temperature until the late evening … -3°C outside vs 18°C target temperature inside resulted in an 13 hours fight coldness vs radiator (openhab told me that the valve state was nearly 13 hours on 95% valve opening until i closed it in the late evening)
… ouch, that hurts really!
Another sad message: Looking at the heat cost allocator it consumes a fourth of the total heat consumption of the whole heating period
This should never ever happen again …
Now I am searching for a way to avoid such a situation …
Yes, the easiest way is to apply a window contact and send a message if the contact stays open too long. This would also address the general problem of forgotten open window.
But at the moment, my budget does not allow to equip everything with a window contact and I wonder if it is possible to detect such a situation just using the radiator thermostats (?)
I am equipped with the Max EQ-3 radiator thermostat using homegear and there are various channels that could be used.
My hope was the channel “valve state”, which is a number between 0 and 100 (percentage) and represents how much open the valve currently is.
My assumption was, if no heating happens, the state should be 0. But its not. Most of the thermostats of my home are 0 but some are also 5 or even 20 and the heater is cold at all. Another one is 60% and its hot.
So i think this does not work (unless somebody tells me that there is a threshold value that must be exceed to count as “heating”)
Does anybody has another idea how to detect such a situation just using this thermostat values? Or should i wait until my contact sensors?