Dirty air filter: A dirty air filter that restricts airflow can decrease the amount of cool air produced. Regular cleaning or replacement of the air filter can resolve this issue.
Malfunctioning fan: If the fan is not working correctly, it can reduce airflow and the amount of cool air produced. This issue will require professional repair.
Blockage in the ductwork: If it is blocked or damaged, it can reduce airflow and the amount of cool air produced. This issue also requires professional repair.