Climate classes (T, ST, N, SN) indicate the optimal outdoor temperature in which a freezer will operate. If the outdoor temperature is outside of the recommended range, the freezer's energy consumption increases, which may affect its performance. If a freezer is designated two or more climate classes, this means it will function throughout the whole temperature range. For example, a freezer designated SN-N-ST will operate in an ambient temperature of 10-38 °C.
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Energy consumption is indicated by a rating system measured by Energy efficiency. Every refrigerator carries a obligatory label clearly indicating its energy efficiency rating, with illustrated energy consumption obtained from ideal operating conditions with an ambient temperature of 20°C, and 70% storage space usage.
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