Duct Boosting - How to increase air flow in ducts

What is the problem ?

For one reason or another many homes have been built with undersized ductwork. Remote rooms that are just plain too hot or cold... What's going on here is that pressurized air (from your furnace, air handler) will take the path of least resistance and not travel to those distant rooms.

What can you do ?

First rule: Cheap things first! Most furnaces or air handlers have multiple speed connections (taps). Perhaps you can raise fan speed on the unit. If you do have too much airflow on the shorter duct runs, you will need to throttle back that air. Dampers located on your grilles or registers are not very useful for this purpose and can cause a lot of noise if used.  Obviously this approach may not work for you and does require some labor.