An air conditioner that consistently shuts off after running for roughly twenty minutes is often experiencing a specialized form of short cycling or reaching a premature temperature cutoff. If your home features an oversized air conditioning unit, it will blast an excessive amount of cold air into the immediate area around the thermostat, satisfying the temperature sensor in just twenty minutes before the rest of the house is properly cooled or dehumidified, causing the system to shut down early. Alternatively, if the twenty-minute runtime coincides with a frozen evaporator coil caused by a dirty air filter or low refrigerant, a safety mechanism may be kicking in. Additionally, a malfunctioning thermostat with failing batteries or poor placement can send incorrect signals that trick the system into thinking the target temperature has been reached prematurely.
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