Quote:
Originally Posted by Nufy
Set at 23 deg C and there is Cool air coming from all registers.
All registers in the lower level are sealed closed.
Next step might be to block off the air return from the top level so that it is only drawing cool air from down below.
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I did this as well, and this might be the cause of the poor airflow. My online research shows that you should not be blocking off registers/air return as it restricts airflow.
Check your coil, easiest way to tell is if the copper line going into the furnace is cold/full of ice, your coil is frozen. Let the fan run for a few hours to thaw.
Change out your filter with a fresh one before starting it back up.