If you are handy, take off the cover and have a look up into the unit. To remove the cover take off the filters on both sides. There are 4 screws that have to be removed and you can see up into the unit. There are two sides, supply air and return air. The supply side is the one that you can see the fan assembly. There is a foam insulation board that should be installed tightly to separate the supply from return side. I found with ours that the board had become loose and there was not enough air flow. I secured the board using foil tape and the air flow has doubled. If the board is in place then you probably have other issues. Good luck
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