I have a Carrier MyInfinity thermostat.  Worked fine with an Arris router.  Uses 2.4Ghz and it simply won't work with the brand spankin new TP-Link router.  Tried everything  and still nothing.  What is "funny" is that Carrier actually will provide if need be a TP router.  Not sure of the model.  If they do that how in the world can this router of mine not work with their crappy thermostat?  Any thoughts on this?