2002 toyota celica gt a/c blows cold but not hard enough

Hi all, I'm new to the forum. We just purchased a 2002 toyota celica gt for my son. It's in overall good condition. However, the a/c doesn't blow very hard out of any of the vents. My husband replaced the blower resister as only the high speed would initially work. That is now fixed. The ac works on all settings, but it still doesn't blow out of the vents hard enough. You can tell there is enough power because you can hear it blowing hard...you just don't feel it. Any ideas on our next step would be greatly appreciated.