Our house is 2 years old and my oldest son's room has always been way too cold. The builder brought an HVAC specialist in last week and he "balanced" the house by measuring CFM at the register and adjusting the rest of the house to be a balanced number. (adjustment consists of closing off vents entirely in certain areas or restricting other areas that are getting way too much flow to increase the areas of poor flow)
My son's room went from 40CFM to over 100CFM which helped a lot - but still doesn't make it 100% in my opinion; that is another argument with the builder in regards to insulation.
The only problem now is keeping my kid's grubby paws off the vent adjustments so they don't undo all the work that they just did.
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