There are a few reasons why you might not be getting air from your AC vents. One possibility is that the filters may be clogged with dirt, hair, dust, and other debris. If this is the case, the airflow through the vents in your home may be reduced, decreasing the efficiency of your air conditioning system. Additionally, if the filters are blocked by some furniture placed right in front of the system, airflow may also be restricted. In either of these cases, it may be necessary to get a contractor to remove any obstructions and/or replace the filters on your AC unit.