Sorry @mperedim. I must have been writing my response when you posted yours, so I missed it.
Looking back through the log, I had 16 offset adjustments across 6 zones on Saturday, when the outside temperature here neared double-digits below zero. (Is it reasonable to expect more adjustments when it's colder outside? I'd assume so but, again, I probably need to ponder it now.)
@zacchaeus I guess this is one of the thing where YMMV. Just today I've got 67 adjustments across four (4) zones, and my temperatures are nowhere near as low as yours. I for sure blame my heating setup (takes quite some to bring up temperature to where I need it to). There maybe other factors, but this seems to be the most important one for me.
Hey @zacchaeus & @mperedim
Wow.......that's way out of my league......you might as well be talking in "tongues" 'cos I have no idea about API's etc........I guess I'm too old and almost a "tech" dinosaur in comparison to you guys.........my name is Rex.....T Rex 🤣🙃
I'll get me coat 😎
@zacchaeus unfortunately my logging needs to be improved. I'll wait another three days for the cold weather to subside, not the best time for experiments, then fix this during the weekend, see what I come up with.
Just came across this so thought I would post a comment to say I have been working on this too.
I use Home Assistant so have targeted that as a solution and did a PR to PyTado and to HA Tado integration. So now the offset can be updated via automations in Home Assistant and I wrote an automation for it as a kind of template for anyone using Home Assistant to copy and paste, which manages all devices in the house (including a battery saver option).
My Home Assistant automation write up is here: https://github.com/north3221/home-assistant-config
It was discussed on Home Assistant here: https://community.home-assistant.io/t/tado-integration-put-offset/175964
and here: https://community.home-assistant.io/t/battery-level-and-temperature-offset-for-tado/81068
If you are not using Home Assistant, you could still take advantage of the PyTado library: https://github.com/wmalgadey/PyTado
I don't really have any high hopes, but with heating season coming up in a couple of months, any chance we can get an update that addresses this issue? I'd really like to avoid changing batteries once per month in my thermostat, without having to spend $$ to buy four temperature sensors.
Yes, I very much agree. I'm starting to look into alternative brands. I need about 7 external sensor and buying complete new thermostats might be cheaper if they have API for external sensors.
Somewhat off-topic but amazon.de currently has a temperature sensor discount at 51€. It's probably been cheaper at times, but it's a decent enough deal (I snatched one; if it does the trick I'll probably snatch a second one on Black Friday or next time there is an offer and stop worrying about this)
Yes, it is unbelievable. It should be easy to fix and yet they don't want to.
I have been running with Tado TRVs and a script updating the offset for 2 years. It works, but not smoothly and they are using a lot of batteries. Also, recently I have noted weird sounds coming from them when calibrating. Maybe they starts to get worn out after calibrating this many times.
I hope they will listen one day and make it possible to set an offset without calibration or PUT a temperature from an external 3 party sensor.
Its not only about money.
I have three external sensors from Tado to avoid the calibration noise on offset change in bedrooms. But the official Tado sensors are so big that my wife just doesn't want them in any room. I would buy a tado sensor for every room if they weren't that huge. If you compare an Aqara Sensor (3.61x3.61x0.89cm) with the one from tado (10x10x1.8cm) it's just insane. Especially if you want to place/hide them anywhere in the middle of each room.