I have an 8 year old Ecobee 3 and it works fine. I have several remote thermostats connected to it. Was wondering if there's any good reason to upgrade it to a newer model. I kind of figured that this screen would fail at some point as it's on 24x7 for 8 years so far. Anyone have an opinion on this?
I am in same boat have a 3 Lite and 4 but mine is set to go dark at night. I havent seen the need to upgrade though I will likely buy another to replace a Lennox thermostat that I hate if they are on sale for Black Friday.
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You made me look at when I purchased my ecobee3 
Never really crossed my mind to upgrade or change to another thermostat as ours only gets used in the summer time here in AZ. We don't use whole house heat in the winter. The set programs just takes over and we barely interact directly with the main device.
Honestly i wouldn't touch it until it dies or it is replaced because the rest of the system is. I agree that the display is the part that will likely fail first. If you lower the brightness though that can be minimized.
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This highlights the differences quite nicely:
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Air quality sensor and 50% larger screen are nice to haves. Honestly, I'm pretty impressed how well ours has lasted. 8 years and still getting the latest updates. For a consumer electronics product, that's not bad. I'll probably grab the upscale one next time it goes on sale. I'll set an alert on that. Thanks @bobbyD. I didn't notice the comparison on their site.
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You know actually...
A certain online retailer has it for $218. Plus I can get a rebate from my gas company of $50 and $30 from my electric company. If all that comes through, that would be $138. Anyone try these rebates? I mean, it's silly since I would be coming from Ecobee to Ecobee, but the forms don't ask what you are replacing.
If not for features, it will ensure that Ecobee keep their lights on for next 10 years, one thermostat at time I upgraded mine to Premium 2 years ago.
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This is pure speculation, but if your are willing to hold out 1 - 2 yrs i’d be willing to bet Ecobee will release a matter version and that may be a more compelling reason to upgrade as it should provide local control.
Granted you can do local control to Hubitat with the latest version now… but requires home assistant, though it does work well.
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I guess you meant Homekit >> Home Assistant >> Hubitat
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Kinda, you can use the homekit protocol to pair the latest ecobee directly to HA instead of your “Home” Setup and then use HA to present the ecobee to hubitat and your homekit “Home”. HA acts as a man in the middle or homekit hub. It works well if you are hardcore about having local ecobee control… but its not for the faint of heart.
Any news on when Air Quality sensors will be added to the API?
I didn't track the API changes, but since you brought this up, Google search says that both the VOCs and CO2 are now available. Will add them to the list of future enhancements on our side.
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Thank you for the info and update.
Actually my current Ecobee integration is Home Kit Controller on Home Assistant
plus Home Assistant Device Bridge. This makes the integration 100% local.
I will check the HA, maybe they already added Ecobee Air Quality Sensor.
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Check upstream, as in Apple Home 
I don't have any apple devices/products/services.
My current Ecobee integration is done via HA Home Kit Controller (this is all what I have for Apple):
Air Quality Entities did not appear in the list of HA Entities.
Am I missing something or HA team simply still did not updated Ecobee integration?
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This is 100% clear.
And I am not asking.
My question was if Air Quality API already released. And it looks like the answer is "yes".
@bobbyD mentioned Apple Home. I don't have anything from Apple and simply
mentioned my current setup and integration. This was not a question by any means.
I am sorry if this was not clear.
Theoretically you have an Apple Home hub. Is just not made or endorsed by Apple, but you are getting all the benefits (your HA is just an Apple Home hub emulator. ).
Do you mean buit-in HomeKit (beta) application or something else?
I am confused, I was under impression this HomeKit app is to bring compatible HE devices to
the Apple Home. And you are saying this is Apple Home hub emulator?
I am sorry for the noise but what I am missing here?
He is saying the the Home Assistant Homekit Controller integration is emulating an Apple HomeKit Hub/Controller.
Hubitat's Apple HomeKit Integration (Beta) is simply presenting Hubitat devices out as HomeKit devices that an Apple HomeKit controller can connect to. Hubitat shows up as a HomeKit 'Bridge' accessory. 
I am not sure, but HA's HomeKit controller may only be able to add HomeKit 'Devices', not 'Bridges'. I wonder if that is why the HA team recently renamed their HomeKit 'Controller' integration as HomeKit 'Device' integration instead? To make it clear that it is only to be used with HomeKit 'Devices' and not with 'Bridges'?
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