I have a Trane Comfortlink II AND a zoned A/C system.  I've been advised it only works with Nexia.  I get a 'complementary' account from Nexia to control it, but if I try to use Nexia for anything else, I'll have to pay monthly.  It'd be nice to have a common interface for everything, but for now I'm OK with the proprietary singular interface for the Trane.  I have no plans to use Nexia for anything else.  I'm no fan of monthly fees. 
  
  
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