An open freezer
  • 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.
  • Warm-up: This relates directly to the amount of insulation the freezer has and gives an indication of how long it would take to warm up 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.


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