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Q: An air-conditioner with a power input of 1.2 kW is working as a refrigerator ( = 3) or as a heat pump ( = 4).

An air-conditioner with a power input of 1.2 kW is working as a refrigerator (β = 3) or as a heat pump (β′ = 4). It maintains an office at 20°C year round which exchanges 0.5 kW per degree temperature difference with the atmosphere. Find the maximum and minimum outside temperature for which this unit is sufficient.

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