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Similarly one may ask, why does Nest say in 2 hours?
Time-to-Temperature for your home to reach the temperature you've chosen. two hours, Nest will read “IN 2+ HR.” Once the target temperature is reached, the Time-to-Temperature will disappear, and the screen background will turn from orange (heating) or blue (cooling) to black.
Simply so, why does my nest keep turning off?
There's a problem with your system and it may need maintenance for a variety of reasons. For example, a clogged air filter can cause your system to overheat and automatically shut off. When this happens, your Nest thermostat can't draw power from your system to charge its battery.
In addition, they continually analyze real world data and update the Nest Thermostat's software algorithms to improve temperature accuracy. So, short answer is in the device itself. But it is highly accurate. | 1 of 3 found this helpful.