re: Adding another return air vent

quote:

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HVAC guy suggested some kind of deal for the bottom of the door which involves cutting a small portion off of the bottom of the door.

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There are grates you can put at the bottom of the door, grates in the wall above the door, or jumper ducts in the ceiling that pulls air from a closed room into a hallway where your return vent is located. Some cut 3/4 inch off the bottom the door to help pull air from the room when the door is closed.

But I think the important point is an understanding that for maximum cooling and heating efficiency, one must pull return air from all areas of the house to enter in air handler. Many think closing doors of rooms not being occupied will help better cool areas of the house that are occupied when just the opposite is true.