So, it's interesting, right? Two parts: control of the rooms, and control of the overall system. One the room side, what's the cost of installing those motori

So, it's interesting, right? Two parts: control of the rooms, and control of the overall system. One the room side, what's the cost of installing those motorized registers? How do you run power to them? Where else in the room do you place sensors? You could probably fish lines through the ducts, but that won't always work and also you've got fire issues to consider. For new work, this is probably pretty easy, but for old work refits it could be a pain in the ass. Also, what's the cost? You're looking probably at another couple dozen bucks per register, easy. Also, how often do you have return vents per-room? A lot of time you have outlets in each room and then a central intake/filter. On the system side, this isn't that bad--a hardened little box or panel that talks to all these sensors and actuates the registers. ~ In a place like Houston or Texas we appreciate our air conditioning, so this makes sense--I'm not sure it'll be something everybody wants. Even then, the existing systems work well enough, and you can always find people to work on them. It's a pretty good example of a system that is obviously improvable and yet one which is probably not worth the effort to fix.