Yes, you should turn off your air conditioner immediately if it is blowing warm air and failing to cool your home. Leaving a malfunctioning system running places excessive, damaging strain on the expensive compressor motor and indoor blower. Turning the unit off prevents further mechanical wear, stops potential ice accumulation on frozen evaporator coils, and gives you a safe window to troubleshoot or call a professional HVAC technician. Verification: Switch your indoor thermostat mode to "Off" and wait for the system to power down completely before inspecting filters.
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