The answer to 'why is my air filter not cooling' is that a clogged or dirty air filter can restrict airflow and prevent your HVAC system from cooling your home effectively. A dirty filter makes your system work harder to push air through, reducing its efficiency and cooling capacity.
Some common signs of a clogged air filter include warm air coming from your vents, your system running for longer periods without reaching the desired temperature, and higher energy bills. Replacing or cleaning the air filter is a simple DIY task, but if the problem persists, it could indicate a more serious issue that requires professional HVAC service.