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We just added a 3 room addition. Two bedrooms that are 11x14 and a den that is 8x16. the problem is that the ducts i put in aren't cooling the area very well. I'm not sure of furnace type but i will get it. Each room i added a 6" flex duct from main trunk, which is in the basement, and ran them to basement wall which the lengths vary from 10' to 23'. Then i reduced to a 4" flex which runs in crawl space for the remainder of the distance, which varies 8' to 16'. They then run into a 4"x12" register on the floor. Why am i not getting any airflow to cool and heat these rooms? Any help would be much appreciated. Thanks
 

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Each of those runs, is almost big enough, to do a powder room.

For those long runs, should have been 8".

Should have actually ran a trunk line into your crawlspace, and then used flex duct from it.
 
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