This is the most important feature of the geothermal heat pumps is that it has the ability of passive heating. What is the meaning of passive heating let us find out. Temperatures vary drastically on the surface of the Earth due to the varying seasons. The temperature on underground the Earth does not vary rapidly.

On the other hand it remains constant. Geothermal heat pumps move heat from one place to another through the circulation of a refrigerant fluid. This allows the geothermal pumps to transfer heat from below the Earth's surface to the residential or commercial areas without active work.

So the geothermal heat pumps are more efficient in cooling and require low maintenance then the conventional coolers and heaters. Since they have the ability of passive heating they require less energy input.

They do not use oil and gas most importantly so they emit very less carbon dioxide as compared to the conventional systems.

The process of passive heating can be explained as follows:

The temperature inside the Earth's surface remains constant throughout the year irrespective of the climate present on the surface of the Earth example winter and summer. Let us consider here heating only which takes place in the winters only.

In the winter season the temperature outside is colder then the temperature below the Earth's surface.

So this differential which is created naturally is used by the geothermal heat pumps to take the warm air from below the Earth's surface and then take it to the compressor and then circulate it in the residential or commercial buildings.

This is known as the passive heating and it is the characteristic of geothermal heating pumps.

This feature of geothermal pumps has enabled it to reduce the emissions of carbon-did-oxide and other harmful gases like carbon mono oxide, sulphur- di -oxide, nitrogen oxide etc.

So these pumps are efficient, easy to use and maintenance free.

The major problem which it encounters is the area of the cost of installation of these pumps. The cost of installation is very high. But this cost can be recovered within the span of five to ten years.

So this is all about the passive heating mechanism of geothermal heat pumps and its advantages and other features.

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