I am about to have my thermostat changed to a Nest Learning Thermostat and thinking of having temperature sensor and smart vents in various rooms so they can open and close when one room gets too hot. I was told that when air travel is controlled at the vents the ones which are closed cause back air pressure which shortens the life of the heating system. Is this true? Any thoughts, plus or minus you can offer on this setup would be highly appreciated. Thank you in advance.