Heatpump issues (air conditioning) HELP!?

Question

Ok, so we just got a new compressor installed in our heatpump. Its been a week since its been installed...There's a problem with low air flow coming out of the vents; and i mean all of the vents. its not just one. so it takes forever to cool the upstairs even though the air coming out of the vents is cold. This means our heatpump stays on pretty much all day and all night, and I know that is probably not good.

What is causing this low air flow? Do we have to call the repair people, or if there something I could do? Also, we recently had the filters replaced.