Short instructional excerpt (YouTube) explaining that increasing air handler capacity alone won't increase airflow if the duct system is undersized; troubleshooting should check (1) the unit, (2) the duct sizing, and (3) the building envelope to locate airflow issues.
If you still have a two ton duct system and you upsize to a four ton, it's not going to matter. You only get two tons of air. So think about the whole scenario in which you're working in and think about what all is happening. So I tell the tech all the time is we check the unit, we check the duct system and then we check the envelope, which is the house or the conditions around the house. So if the unit is working great and the duct system is sized properly, then it has to be a house problem.
How to Prevent Mold and Odor in Your Air Conditioning System with UV Light #shorts
