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Ecovent seems to have the necessary feature set to manage home temperature room by room. Although they require a smart vent on every vent and sensor in every room, they include static pressure monitoring (if you shut off too much flow you do more harm then good). So it's an intriguing product but other than a few paragraphs on their site, I see very few independent reviews, blogs, or any post by someone who's tried it. Anyone here give it at least a test spin ? The only viable alternative is Ecobee with Keen but that lacks any static pressure monitoring and has only limited ability to even out heat/ac demand (e.g. if a room isn't getting enough Keen has limited remedies unless it's put in enough other rooms to even out total flow).
My only other reservations are the Ecovent sensors which seem a bit bulky and the look of the vents. The latter can be addressed by mounting them behind an exterior grill. Oh, and cost. The vent units themselves are over 2x the cost of Keens. Still it looks appealing. Maybe the right thing to do is wait till they have version 2 or 3 of their hardware.
I've corresponded with them at length but would like to hear from anyone who's actually purchased it.