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It would appear to me that the master bedroom has a much higher heat gain than the two bedrooms. During the heating season, it requires less heat. It reaches the set temp much faster than the two bedrooms and therefore they remain colder. During cooling season, it requires more cooling and therefore the two bedrooms are overcooled. I would wager that the master has large south facing windows, and that the t-stat is exposed to direct sunlight. I only place the t-stat in the master bedroom if it is its own zone or the homeowner requests it to be placed there, otherwise I put it in the hallway, out of direct sunlight and away from the supply vents and returns.
 
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