So here’s a suggested feature for controllable register Keen Vents that I haven’t seen, and for which I maintain a copy of a now-withdrawn ST application in order to implement.
The issue is ceiling-mounted registers. These are fine for cooling, but for heating, they are pretty bad.
They heat the upper half of the room until they warm it up down to the thermostat, and when heating stops, it leaves the seating level and floor much colder.
The solution is straightforward with a temperature sensor in the room, and a ST app:
- if the room temp sensor is a few degrees cooler than the setpoint, open the register wide open to 100%, in order to blow as much hot air downward as hard as possible and produce best-possible circulation.
- as the room temperature approaches the desired temperature, close the register to 50-70%, to continue warming without superheating the room.
- when the temperature in the room is at the setpoint, close the register to 10-20%, to maintain comfortable air circulation until the HVAC stops heating.
I’ve also elaborated on this, to close the vent in my bathroom automatically when the system is cooling (and to prevent cold duct air from entering the bathroom during initial heating). I have it set so that if the Keen Vent temperature sensor is lower than 70F, it closes the register to 10% until hot airflow warms the vent.
So that’s the notion - it could be a simple setting - “Celling Register” or perhaps with a second level of more-detailed settings for the temp thresholds.