# Check the thermostat settings.
# Inspect the air filter for dirt and clogs.
# Ensure the circuit breaker is on.
# Examine the outdoor unit for debris or obstructions.
# Listen for unusual noises.
# Check for refrigerant leaks or low levels.
# Test airflow from vents.
# If issues persist, contact a professional HVAC technician for a thorough diagnosis and repair to prevent further damage or inefficiency.
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