Yes, you should immediately turn off your residential air conditioning system at the thermostat or circuit breaker if it is running continuously but failing to cool your home. Allowing a malfunctioning AC to run indefinitely can cause severe mechanical damage, particularly if the indoor evaporator coil has frozen solid into a block of ice or if the compressor is overheating due to low refrigerant or restricted airflow. Turning the system off prevents the compressor from burning out and gives iced coils time to melt safely. You can troubleshoot basic issues while the system is off, such as checking and replacing a clogged air filter or clearing debris from the outdoor condenser unit. You can verify that it is safe to turn the AC back on when filters are clean and diagnostic checks confirm normal operating parameters.
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