Short answer is that it does not redirect flow to different rooms, you would need baffles for that. Instead the unit tries to average out the temp in each room. Have a room that is always more hot than the rest? The thermostat will run a little longer to cool it off. It doesn't freeze the other rooms though, it's looking to balance everything out by getting an average temperature. It just makes everything more comfortable. The sensors also detect motion which is how the unit knows if anyone is home or not