太阳能供暖指的是给建筑物内部加热。

Space heating means heating the space inside a building.

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高密度窗，和孤立密闭的结构，使被动式太阳能通过内部加热的形式进行加热。

High efficiency Windows, together with insulation and airtight construction, allow passive solar heat to come through and keep the energy inside in the form of heat.

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利用地球内部的热量加热冷水被称为地热加热，这不算什么新思想。

GEOTHERMAL heating-using the warmth of the Earth's interior to heat water-is an old idea.

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