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7/30/19
Can sensors trigger fan to come on to automatically equalize rooms when temperatures vary 0 Recommended Answers 4 Replies 2 Upvotes
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My house has two Nest thermostats and 6 sensors. It would be excellent if the system could detect when any sensor is 2 degrees warmer or colder than the rest and turn on the fan in order to equalize the temperature. When needed the compressor could come on as well.
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7/31/19
Hi Paul,
 
We hear you. As of the moment, our sensor can do detect changes but it will not automatically run your hvac unless there is a schedule set. You could check out on this link. Let me pass this request along to the right department.
 
All the best,
Allen
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7/31/19
I think it would be a great feature to add to the product; It addresses the core pain point with AC systems overall. 

I did look into the sensor schedule functionality and while it was helpful it does not correctly address the problem. When the system turns on the compressor because one room is hot it ends up making one room comfortable while everyone else is freezing downstairs and my upstairs area (different AC also Nest) gets hot because the downstairs overwork makes the upstairs think it is cool and does not kick on enough.
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8/25/19
I am very much hoping that the functionality of the additional sensors in the Nest system is expanded. More accurately, I'm hoping that the Nest software system and associated logic is expanded to more fully utilize the possibilities of additional sensors. Some houses cannot be easily "re-zoned" into multi-zone systems and the use of additional sensors would be a very cost-effective solution.
Just like the original poster suggested, the sensors could be used to detect when the remote space may have a temperature differential beyond a set variable of degrees. When, for example, the upstairs is more than X degrees hotter than the main level, and the main level has already reached the desired set temperature, then the fan will circulate the warm air from upstairs throughout the system, thus "stirring" the air. This might perhaps raise the temperature of the Main level, but that's when the compressor comes back on to cool further. The compressor only comes on when needed. The fan, which uses only a fraction of the energy of the compressor, will do most of the work.
The only drawback I would have is that my home's duct work is a bit leaky in places that aren't easily accessible, so I'll have a bit more energy loss, and perhaps unnecessary humidity gain. But I strongly suspect the energy savings and comfort level attained in keeping my upstairs and downstairs more equalized would be worth it.
All we need is a little more programming logic created; and actually quite simple logic at that: If the difference between Main Thermostat and Remote Thermostat(s) is beyond X degrees (user set variable) , then run the fan until the difference is under set variable. Easy Peasy Google Programmers! LETS GET IT DONE!
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9/12/19
Agreed! Additional logic capability and also flexibility with the sensors' schedules would be a home run...and get me to buy more sensors.
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