I have two of these (for separate HVAC systems on top and bottom floors of my house) and can highly recommend
The killer feature of Home Assistant vs. my previous Nest setup came when I added door and window sensors, and programmed HA to pause heating/AC whenever doors or windows are open. I no longer turn into my father, who I remember shouting at us kids, "close the door, I'm not paying to air condition the outside!"
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Honeywell T6 Pro
https://www.amazon.com/Honeywell-Intrusion-TH6320ZW2003/dp/B...
I have two of these (for separate HVAC systems on top and bottom floors of my house) and can highly recommend
The killer feature of Home Assistant vs. my previous Nest setup came when I added door and window sensors, and programmed HA to pause heating/AC whenever doors or windows are open. I no longer turn into my father, who I remember shouting at us kids, "close the door, I'm not paying to air condition the outside!"