A refrigerator including a main body including a storeroom; an evaporator arranged in the back of the storeroom and configured to generate cold air; a defrost heater arranged under the evaporator into which air flows and configured to remove frost or ice formed on the evaporator; a temperature sensor arranged on the top of the evaporator and configured to measure temperature; and a controller configured to stop operation of the defrost heater in a first defrost cycle based on a first measurement measured by the temperature sensor and stop operation of the defrost heater in a second defrost cycle based on a second measurement, which is different from the first measurement.