What is Geothermal Heat and Air? How Does It Work?

The term geothermal came from Greece: the first element “Geo” explains the earth, while the term “Thermal” describes the energy that comes from the land. Heat can be used as an energy source in a remarkable way, from complicated power stations to basic heat pumps. In reality, this heat energy is called “geothermal energy” and can be found around the world.

The geothermal heat and air system can be schematically defined as the’ water convection in the upper crust of the earth, which transfers heat from the heat source, typically in restricted space, to a heat sink.

Heat source:

can reach temperatures over 600 ° C, and are often made up of magmatic intrusion at fairly shallow depths (5 km to 10 km).

Heat pump:

Because the earth has a constant temperature, the earth’s thermal recovery cycle uses the ground loop to provide the fuel. The electricity from the earth is stored by tubing and used primarily to preheat the air supply.


Size of hot rocks from which heat is derived from the transmitted fluids. The reservoir is usually covered by impermeable rocks and is directly linked to a surface recovery zone where meteoric water will partly substitute the fluids that flow out of the reservoir or are drained by the borehole.

Heat-carrier fluid:

The geothermal fluid usually consists of water, but can be combined with other polymers to increase the calorification potential of the fluid. It includes natural compounds and gasses including carbon dioxide (CO2) and sulphide (H2S).

Distribution system:

The energy transfer system gathered from the ground to the house ready for heating. Can be an in-floor or ducted system, In reality, the ground under us is at a constant temperature, meaning that in winter it is hotter than outside and in summer it is colder

Two forms of installation can be characterized:

Winter operation:

The underground pipes, often referred to as the ground circle, provide water to maintain warmth from the Earth and transfer it to the heat pump indoors. Instead, the heat pump extracts the heat from the fluid and disperses it in warm air in your house.

The water is refloated to collect more energy from the bottom as it has been extracted from a liquid. The circle of water becomes cooler as it reaches the house than when it turns to the ground.

Summer operation:

The heat pump indoors extracts the heat from your house and pushes the heat out. This disperses cold air through ventilation. Across the earth’s circle the heat extraction from the surface is rejected.


Types of Geothermal Heat and Air Systems

Since underground and underwater temperatures stay more stable than air, geothermal heat and air pumps are more powerful than traditional air-conditioners and heaters.

No equipment may intervene in your countryside or be destroyed due to bad weather outside your home and above ground. Geothermal heat pumps involve closed loop, open loop, horizontal and vertical systems, among others. Sandhills Heating & Refrigeration experts will let your family and you know which is the best option for your house.

Closed Loop:

An underground continuous loop system consists of an anti-freezing liquid filled with an underground continuous pipe loop which helps pass the ground temperature into the geothermal heat pump. You can install vertically or horizontally a closed ground loop system according to the size of your yard. The pipes are pushed by a pump to absorb the heat, move it to your home in winter. The water is then transferred. A fan forces air into the moist pipes and into the ductwork of the system.

Open Loop:

The principal difference between open and closed looping is the usage of ground water.  A less popular open loop system requires a broad groundwater supply. An open loop system is directly attached to a groundwater supply such as a well or pond which pumps the water directly through a building through which it is used to heat and cool.

Open loop systems are some of the cheapest because no drilling is needed or very little digging is feasible. These may also be used as water heaters with the correct water filtration system.

Horizontal system:

Each has water-filled or coolant-filled tubing embedded in trenches. Also, geothermal systems are the best choice for new construction or existing houses. Nonetheless, you will need a huge number of pipes and a ton of soil to carve, which is hundreds of feet deep.

Vertical system:

The vertical system utilizes a few feet long and hundreds of feet deep holes for its pipes instead of from the horizontal trenches. The vertical tubing combines with horizontal pipes known as multipliers through these gaps and continues to the heat exchanger.


This may surely be worth an HVAC geothermal heat and air system. Because they are so energy-efficient, you will not have to use as much electricity as you will for a conventional HVAC system to get the same heating and cooling results for your house.

This system is long in addition to being more energy-efficient and cost-efficient, primarily because a machine ventilates, compressor and pump are also installed inside. A geothermal heating and cooling system often require less maintenance, which results in reduced system costs over the system lifetime.


While a geothermal HVAC system or geothermal heat and air is energy efficient and the long-term economy that can be created by a new geothermal heating and cooling system, the initial costs are always an obstacle to purchase for the homeowners.

Geothermal heating and cooling pros and cons:

geothermal heat and air were once a rare phenomenon, but it’s increasing today as more homeowners are trying to heat and cool their homes for the less of conventional methods. When you decide to trade geothermal power pumps for your furnace and air conditioner, you would have to know the geothermal installer in your area which is happy to do the work. But recognize first of all the advantages and disadvantages of this environmentally friendly HVAC system.

Advantages of geothermal energy

Highly efficient heating and cooling:

because geothermal energy requires not only heat transfer but also equipment that can operate at an output of between 300 and 500 percent.

Low effect on the environment:

the greenest renewable electricity source today is geothermal energy. It is almost pollution-free and does not require combustion, unlike oil and gas furnaces.

Renewable heating and cooling:

Fossil fuels come to an end quickly, but geothermal power is different. This all absorbs power from the ground, which is even more constant in the weather than the climate per season.

Not weather dependent: 

solar or wind power are known as renewable sources, because they never cease, however, there can be losses of short-term electricity demand as the sun goes down and the wind stops blowing.

Disadvantages of geothermal energy

Cost of HVAC systems:

The installation cost for a geothermal heat pump is a disadvantage and is higher than with many HVAC systems. Nonetheless, the investment will pay for itself in only five to ten years with incredibly effective results.

The most suitable solution for new houses:

a geothermal heat pump may be installed in an existing building; however, excavation retrofitting is needed. The system becomes even more practical throughout the new construction.


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