I have a Rheem Classic 90 and it currently has a blower moter that is currently 3/4 hp with 1110 rpm. It's a 3 story house and the hvac is located in the basement on the west side.The problem I'm having is that the bedroom on the opposite wall on the second floor as well as the attic room gets very minimul airflow. The attic did not even have a vent, so we inserted a vent from a second floor bedroom with good output up into the attic. But just so you know, there are no returns in the attic space. I've had 3 service men come over and they have ALL suggested different things. #1 said he would install blower motors in the ducts that service the weak rooms. #2 said he would redo the entire duct workings in the basement. He said there were too many elbows and such. #3 said he would upgrade the blower motor to a 1625rpm. When I called the hvac supply company about upgrading the motor, he never heard of such a thing. So I'm really confused as to which way I should go. Any advice would be greatly appreciated. Thansk!