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Author Message   Musicfan Bewarse Legend Username: Musicfan Post Number: 67142 Registered: 05-2004 Posted From: 68.43.244.96 Rating: N/A Votes: 0 Posted on Wednesday, December 26, 2018 - 1:56 pm:    ecobee4 is best, however its not compatible with old generation HAC's. Some additional wiring will be required if not existing. nest is universal compatible and very easy to install.. thats an edge over ecobee4. NTR biopic Audio Review