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Too little air flow caused by dirty filters, a dirty evaporator coil, a dirty blower or one that is set on too slow a speed or a loose fan belt if you have one are the most common. A mismatched condenser and evaporator, air somehow bypassing the evapoartor coil, low refrigerant charge due to a refrigerant leak. Running the house temp down too low, closed or blocked return grilles and/or supply registers, long piping runs with out sufficiently increasing the pipe size, and improperly sized ductwork are some of the tougher ones to diagnose.

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