The rear AC is NOT directly in the bedroom, correct?
There is just a little duct running to the bedroom, correct?
Did this system ever work to your satisfaction in the past? If so something has changed.
What is the temperature of the air being put out by the rear AC unit?
Need to determine if it is a problem with the AC, or insufficient airflow.
A fan blowing into the room does not circulate the air, it just pressurizes the room. Some comes out above the fan, but it just gets sucked back into the room by the fan. Very little actual circulation. A fan pulling air OUT of the room may be more effective.
