I just had a new AC system installed in a small condo I recently bought. The problem is that the main and only bedroom is located almost beside the air handler and as such the duct that emerged from the plenum is at most 4 feet long and straight (made of duct board).
In this setup, as the unit is efficient, I have an excessive air flow to the master and as such, the temperature goes sharply down and is unbalanced. Noise is also an issue.
I've tried many registers with louver and opposing damper blades, but if I close them even slightly I get increased noise.
What do you think of the following -
I suspect that the AC company installed a blower which is over supplying in relation to my needs in the bedroom. The problem is that the temperature is fine in the rest of the condo which has high ceilings as it's on the top floor.
What would you think of reducing the overall diameter of the rectangular duct in about 40 - 50% with duct board. The tech already tried this, but he only jammed a wedge about two feet from the register reducing the effective diameter and this caused increase noise probably due to a venturi effect. My idea is to reduce all the ducts diameter to about 6" from the register with duct board or a sound insulation duct liner (very expensive).
I'd really appreciate your opinion on this matter.
Any ideas on what I can do?