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Hi there, There really is no optimal option as it is up to you. This depends on the type of food/beverages inside, the amount and your own liking. Most of our customer usually opt for leaving the temperature in the middle. - Janína G. | Insignia Support | https://www.insigniaproducts.com/contact-us
Sorry, there was a problem. Please try again later.0°F (-18°C) or below is optimal (FDA), which should be between 1/2 to 2/3 of the way on the dial.
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