Hello Mark and thank you for writingAn AC unit's evaporator coil resides in the indoor air handler and is responsible for cooling the warm air drawn from the interior of your home. But if you have a clogged air filter or some other airflow issue, then frost can build up on your evaporator coils. This can cause your system to shut off frequently.If there's something wrong with your AC that makes it shut off after just 15 minutes, it's usually one of these issues: Unit is overheating.

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This often means there is simply a buildup of grime inside the compressor unit, but it could also mean there's a refrigerant leak or have other causes. Faulty thermostat.Hope any of these help.