Here in Texas, its already starting to warm up. I have a 250sq/ft media room located above my garage. The room has two registers located about 3.5' up on one wall. When the house was built one yr ago, there was no Return put in that room. I am already planning to put a return in. My question is what the benefit would be to install a in-line duct fan in my return, to either be able to switch on or off, or have it on a seperate tstat. My understanding is that this would pull air from the room forcing it back into the system and then out through all of my returns in the house. Im hoping this would help in keeping the temperature between both floors at a more constant temperature. I would appreciate any help or suggestions on this matter.