谢谢你的信息。请问你说的是：“Ground-Source Heat Pumps” 还是 “Air-Source Heat Pumps”。 我邻居一年四季都住那里几十年了，他是“Ground-Source Heat Pumps”，通过水循环加热。据他说比较节省电，他是大房子，有一面全玻璃。
有关“Ground-Source Heat Pumps”，我上面贴的政府网站说：
Efficiency
In Canada, where air temperatures can go below –30°C, ground-source systems are able to operate more efficiently because they take advantage of warmer and more stable ground temperatures. Typical water temperatures entering the ground-source heat pump are generally above 0°C, yielding a COP of around 3 for most systems during the coldest winter months.
Energy Savings
Ground-source systems will reduce your heating and cooling costs substantially. Heating energy cost savings compared with electric furnaces are around 65%.
On average, a well designed ground-source system will yield savings that are about 10-20% more than would be provided by a best in class, cold climate air-source heat pump sized to cover most of the building heating load. This is due to the fact that underground temperatures are higher in winter than air temperatures. As a result, a ground-source heat pump can provide more heat over the course of the winter than an air-source heat pump.
不知道有没有其他人完全依赖这个冬天取暖的。一个朋友准备重建，考虑用这个。
有关COP的：
Not sure what the COP means for heat pumps and air conditioners? Find out everything you want to know here!
www.adams-air.com
www.nrcan.gc.ca
说如何通过和室外换热达到加热原理了。
