An air conditioner blowing lukewarm air instead of chilled air is typically caused by restricted airflow or a lack of refrigeration capacity. Common culprits include a heavily clogged air filter choking the evaporator coil, low refrigerant levels from a slow leak, a dirty outdoor condenser unit covered in dirt and debris, or a failed compressor capacitor that prevents the compressor motor from pumping refrigerant. When these components fail, the system cannot absorb or dissipate heat effectively. Verification: Check indoor supply vent temperatures and inspect your indoor air filter for dirt buildup.
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