The ideal temperature range The freezing point for water and many foods is 32 F (0 C), so you might think that your freezer would be safe set around there. Wrong!

The Safe Zone The correct temperature for your freezer is 0 degrees Fahrenheit —if you set it to 0 degrees (-18 degrees Celsius) and keep it fairly full, it will maintain that temperature.

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He writes: "Set your fridge to 37 degrees and your freezer to 0 degrees. This will keep your food fresh, but your fridge and freezer won’t need to work as hard to maintain the temperature." ...

What temperature should my freezer be? Your freezer should be set at -18 degrees Celsius. Although keeping foods in the freezer makes them last longer, some think it will stop bacteria from growing.

Although ULT freezers are designed to work between -86°C and -45°C, they often work at a set temperature. These freezers can last for about 12 to 15 years.

As Ramirez-Aguilar recalls, the lab had called a freezer technician, who, after some tinkering, suggested going easy on the machine by adjusting the temperature to –70 °C.

Adjusting the thermostat temporarily can help the unit recover more quickly under heavier use. In warmer months, hotter kitchen temperatures put more pressure on fridge and freezer performance.