First off, the house is an older house, split level design. The living area and the master bedroom stay cool. The other 2 bedrooms upstairs, however, don't seem to stay cool that well. The system is an older Rheem 13 seer unit.
In the hallway upstairs, there appears to be a return vent that is approximately 16" long and 2-3" high.
On the lower level, there are 2 vents that are fed by 2 separate 4" or 6" ducts. Which imo, would be alot of unneeded air for a small area.
What I want to do is break one of those 2 ducts and install a cap as close to the air handler as possible. Is this a good idea?
The other option that I was entertaining was to upgrade the blower motor to a more stronger blowing one. The air coming out of the vents is cold, not cool, cold. I just don't think there is enough of it in those 2 bedrooms.
Suggestions and thoughts are welcomed.