Uneven Heating and Cooling Throughout House - What's the Cause?

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I have a brick three-bedroom rancher built in 1974. We blew insulation into the attic when we moved in, and last year installed brand new windows throughout the entire house. Yet when I close the doors to two bedrooms they get warmer in the summer and cooler in the winter. A lot of air that comes from the registers. There are also 31-inch air returns on the walls in both rooms. Is it possible that these are too big for the rooms and causing this problem?  Or could it be something else?

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