The answer to 'air filter not cooling' is that a clogged or dirty air filter is a common cause of poor cooling performance. A dirty air filter restricts airflow, making it harder for the HVAC system to circulate cool air throughout the home. This can lead to uneven cooling, hot spots, and the system having to work harder to maintain the desired temperature.
Some other potential causes include low refrigerant levels, a malfunctioning compressor, or issues with the ductwork. If the air filter is the only problem, this is usually an easy DIY fix. But if the issue persists after changing the filter, it's best to call in a professional HVAC technician to diagnose and repair the underlying problem.