re: Adding another return air vent

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I have a 4 ton unit in the attic with a 3.5 ton outside if that makes sense. I currently only have a 20x20 return air vent in the hallway. My master bedroom is in the back of the house and I feel like this room is the warmest. They suggested that I add a return air vent in my master bedroom which is the farthest point from my ac unit in the house (probably a good 40 feet). I have no idea of the size of the duct that they will use.

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Had the same problem in my house. What I did was put a 12'x12" with a 10" flex duct. Fixed the problem. That run was well over 50' Total cost was around $150.

If you need some 10" flex duct, I have 3 rolls that are 25' each. Those cost around $70 each, but will sell them to you at half price. They were extra from my guest house build. You can buy the connecters, intake grill and tape at Colburns in Baton Rouge.

On a side note. The master bed room in my house is complete sound proof which was blocking free flow.