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Re:Nest launches $39 temperature sensor by pwg on Thursday March 15, 2018 @01:47PM (#16594985)
That was, partially, explained part way through the article:

These sensors make the whole system more accurate and keep things comfortable. That might come at the cost of overheating another area of your home that you’re not in, though. Unless you’ve got smart vents, heating systems are nowhere near precise enough to set different climates for each room.

Re:Nest launches $39 temperature sensor by Zhenya on Thursday March 15, 2018 @03:23PM (#16595793)
So basically for heating this is a "min temp" sensor per room. For cooling I assume "max temp".
Re:Nest launches $39 temperature sensor by pwg on Thursday March 15, 2018 @03:37PM (#16595905)
That's what I read as implied by the quote from the article.