Let us know if you need testers 
Thank you for your help!
I actually wanted to make this, but this is my first time posting here, so I didnāt know how to make it.
This helped me a lot!
By the way, can I know which design you prefer?
Iād prefer āAā.
To me itās a cleaner look, fits better with most styles. To my eye, the round one would look out of place unless you were going for a steampunk or Titanic-era ocean liner look. Round thermostats, like round portholes, are a thing of the past. B reminds me of a dinner plate.
That said, Iād be buying based on functionality and value. I would be equally willing to buy either one, if it fit my needs and budget.
Hi Tom,
Since itās my first time posting, my reply count was restricted yesterday, but now I can finally reply to you.
Thank you for voting. I personally prefer A a bit more as well.
Speaking of the budget, what is your budget range for the Zigbee thermostat based on design A?
Features? Battery life or power supply requirements?
Youāre calling it a āthermostatā: what does it actually do? Is it just a temperature sensor?
B looks like a cleaner look, but it also looks like it is easier to clean actually.
A looks problematic if it gets dirty in the indented ring.
If it supports e-bus and Zigbee, max ā¬100
ā¬100 seems in line with other smart thermostats. A bit more than Iād like, but I sometimes forget that prices arenāt what they were 3-5 years ago.
So, on to functionalityā¦
My Honeywell smart thermostats have logic to optimize on/off cycles, keeping the temperature constant, rather than toggling on and off at certain values above and below the desired set point. There is a setting to ātuneā this feature for different types of HVAC equipment. They have a built-in, 7-day schedule function which can be set up on the device itself, or remotely via the app. Unfortunately, all remote management and monitoring is done through the vendorās cloud, something we donāt want in HA. But Iād still want the thermostat to continue to work, and run its schedule, if HA or the LAN were unavailable.
A fully local device which had all those features would be a nice alternative to the current choices in the market.
It will be Zigbee, according to our experience, the retail price will be ā¬50~70
This is an old thread. But youād want to know if your āpollāārespondents are actually in Europe. In Ireland (and the UK), you would want the square one, and ideally it would be ~85 mm square like wall switches are. I would guess the same would be true for the continent.