At outdoor air temperatures and low places, because of lack of heat in winter for heat, the need for auxiliary heater.
在室外空气温度低的地方，由于热泵冬季供热量不足，需设辅助加热器。
Outdoor air temperature in the low places, due to lack of heat in winter for the heat required to set up auxiliary heater.
在室外空气温度低的地方，由于热泵冬季供热量不足，需设辅助加热器。
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