I’m using two Rule Machine rules for opening/closing my EcoNet vents. One rule sets it almost closed (5%, configured as a dimmer) at bedtime; in my case it’s time-based, but you could just as easily make in Mode-based. The other rule opens the vents fully (configured as an on/off switch) when temperature gets to within 1 degree of the heating or cooling setpoint. I’m using a Nest thermostat, but you could use any integrated device that reports temperature.