- Temperature performance: We check how well the freezer maintains even temperatures. We also check how it copes with ambient temperature change – and whether the freezer allows a good range of temperature choices and the controls’ mid setting gives an appropriate temperature.
- Energy efficiency: We check energy use and comparative energy efficiency of the models.
- Cool-down: We measure how long it takes to cool the air in an empty freezer, from when it’s switched on until it reaches -13°C in a warm temperature-controlled room.
- Insulation efficiency: This gives an indication of how the freezer would perform in a power-cut. First the freezers are switched off in a room with an ambient temperature of 32°C. The test starts when the freezer temperature is -15°C and ends when it gets to -5°C. The longer this takes, the better.
- Ease of use: We assess storage, access and general versatility, ease of cleaning, and how easy the controls are to use.
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