A heating unit used during extremely cold weather to assist the GSHP when it cannot provide all the heat required. 在寒冷气候下地源热泵不能提供需要的所有热能时起辅助作用的热设备。
And the energy-saving ground-source heat pump construction technology is utilized for the first time in Yueyang and will be promoted among other provinces and cities in China. 地源热泵施工技术节能环保，在岳阳属于首次，在国内处于推广阶段。
