Google Nest Learning Thermostat (4th Gen, 2024) with Nest Temperature Sensor – Energy Saving Smart Thermostat – Compatible with Alexa, Apple HomeKit and Google Home App – Polished Gold

Smart thermostat
This device allows you to make schedules and suggests changes to help save energy and money. It ensures the temperature is set at the right time, and it uses your phone’s location to adjust the temperature for when you’re home or away. And as an added bonus, it looks really cool.

May not work in HVAC systems without a C wire, when the 3rd Gen Nest Thermostat will
When one of our 3rd Gen Nest Thermostats stopped working, I decided to replace it with a 4th Generation Nest unit. Oddly, the mounting hardware for the 4th Generation is completely different from the 3rd Generation, which is annoying. The wiring backplate is incompatible, as the 4th Generation has a different electrical connector to the thermostat. One nice thing about the new backplate is that there is a light built into the bubble level which signals voltage on the Rh or Rc wires from the HVAC unit, implying you won’t need a dedicated C wire for power. Unfortunately, this is many times not the case for the 4th Generation, lit bubble level or not.When I properly mounted and connected the 4th Generation thermostat, the setup app on my phone reported that there was “no power” on the R wire, even though the bubble level was lit, and I could measure the voltage on a multimeter. There was no way to get around the error message in the app. A call to Google support was completely useless. The support person clearly didn’t know why the setup app falsely reported “no power”, or whether or not the 4th Generation thermostat required higher voltage on the R wires than the 3rd Generation thermostat for operation without a C wire.An internet search revealed numerous people posting on Reddit and other web sites of the same issue I was having. How could Google support not be aware of this? Depending on your view, the difference between the R wire voltage requirements for the 4th Generation from the 3rd Generation thermostats is either an undocumented design change, or a design flaw. Personally, I consider it a significant design flaw, especially that it is not documented in the setup instructions, and there is no warning of this anywhere in Google’s documentation.After spending about two hours removing the 3rd Generation mount, installing the 4th Generation mount, waiting for the callback from Google, and figuring out the root cause myself, I unmounted the 4th Generation Nest, packaged it back up, and returned it. I ordered a new 3rd Generation Nest from Amazon, and it works flawlessly with the HVAC unit.One attraction of the 4th Generation Nest is that the “maintenance band”, the temperature variance range at which the AC compressor cycles on and off, is manually programmable, while on the 3rd Generation Nest it is not. There have been complaints that the 3rd Generation Nest’s maintenance band is only two degrees F wide, which in some climates and homes cycles the compressor too often, and is blamed for excess wear and premature failure on the compressor. (AC units and heat pumps both use compressors.) So if you have a C wire in your compressor-based system, I recommend trying to use a 4th Generation Nest. Another trick which works with both generations is to use a remote sensor in a different part of the room or another room where the ambient temperature doesn’t vary as quickly, to reduce compressor cycling. I use this trick for our 3rd Generation Units, and it also works for 4th Generation thermostats. Note that using a remote sensor this way may require some experimentation to get the desired result, while the feature to manually adjust the maintenance band makes it quicker and simpler.I really like the Google Nest thermostats when they’re working the way they’re supposed to, but the lack of backward functional capability from the 3rd Generation model to 4th Generation model is inexcusable, since there’s no warning about it. And Google support is ineffective in helping less technical buyers. The least Google could do is document the issue properly on their web site.

THermostat nice but Google Home App not so nice.
Got this thermostat version 4 to replace my old version 1 which was loosing wifi support . New learning thermostat installed easily looks good with big new display . Only problem is Google buying nest and using Google Home app for remote control of the thermostat. Google Home tries to connect to all smart devices you already have and so is more complicated to use. I see no way to only have Google home just connect to the thermostat and delete everythine else. Now google home see the new thermostat and lists all its properties but cannot read or set the temperature. I will update this when I get the google home to work right.Update on Google home — it seems like google home app is not working yet for the learning thermostat 4. After several attempts to install the thermostat after resetting it , and replacing the app , I hit the help link and was surprised when I quickly got a support person on the phone. They informed me that it was a known bug and they were working on it. This is strange considering google has been pushing the learning model 4 on previous owners of version 1 nest. Will I get an email when it is fixed??

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The Next Gen 4 Thermostat is a fantastic addition to my smart home setup! It’s incredibly easy to install and use, with a sleek design that looks great on the wall. The intuitive controls and app connectivity make adjusting the temperature effortless, even when I’m away from home. The energy-saving features have already made a noticeable difference on my energy bills. I also love the detailed reports and insights on energy usage. Highly recommend this for anyone looking to upgrade their home’s climate control system!