In winter, when the outside temperature is (0^{circ} mathrm{C}), a room is to be maintained at (25^{circ}
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In winter, when the outside temperature is \(0^{\circ} \mathrm{C}\), a room is to be maintained at \(25^{\circ} \mathrm{C}\). The heat loss from the room is estimated to be \(5 \mathrm{~kW}\). Two alternative strategies to keep the room temperature constant are:
(a) direct electrical heating and
(b) reversing the room air-conditioner. Which is the better proposition?
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