Air conditioners like any other appliance also require TLC for it to function at its best. ACs that are not in the best condition are those that cannot perform well during the warm months. Regardless of the brand name and type of air conditioning system you have, when the filter is clogged it will block the airflow. This decreases the efficiency and capacity of the AC system to cool the air. If you still have not done this, do it now and check the filter regularly from now on. You may also need to change your filter when you have a pet at home.