Let's not sugarcoat it—installing a geothermal system is expensive. Even so, a geothermal system will cost about 40 percent more than a traditional HVAC system. Recouping these costs through energy savings could take as little as four years or as long as 15 years depending on utility rates and the cost of installation.
Geothermal heat pumps use about 75 percent less electricity than a traditional electric HVAC system, and are both cheaper and more eco-friendly than using heating oil or propane. With solar electricity + geothermal, you can eliminate your home's entire carbon footprint.
Geothermal power plants are associated with sulfur dioxide and silica emissions, and the reservoirs can contain traces of toxic heavy metals including mercury, arsenic and boron. Regardless of how we look at it, the pollution associated with geothermal power is nowhere near what we see with coal power and fossil fuels.
Solar farms could provide a return of around 6% a year. They provide a clean, renewable source of energy that could help prevent future energy shortages.
To use active solar heating to heat your house, panels of tubes or pipes — called a radiant slab system — are installed in the floors or walls of your home. You may need to have a water storage tank installed in your basement to retain hot water and transfer its heat to a heat pump.
All of them are designed to operate at from 180 – 200 °F. Geothermal systems, though much more efficient operate at between 100 – 120 °F, and are not compatible with distribution systems originally designed for much higher temperatures.
The Plug & Play Grid-tied Kit is similar to any other appliance that plugs into a standard 120Vac outlet. The only difference is that the unit produces power instead of consuming it. When plugged in, a single unit will produce up to 216 Watts for anything currently using power within your house.
That means you'll only need (1,412.5kwh per person x 0.65) 918.125kwh of electricity per person. Compare the number above to $4,864 and you can see that you'll save 67.5% on your heating costs every year, for the lifespan of the heat pump.
Geothermal energy is a very powerful and efficient way to extract a renewable energy from the earth through natural processes. This can be performed on a small scale to provide heat for a residential unit (a geothermal heat pump), or on a very large scale for energy production through a geothermal power plant.
Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.
Geothermal energy is produced by the heat of Earth's molten interior. This energy is harnessed to generate electricity when water is injected deep underground and returns as steam (or hot water, which is later converted to steam) to drive a turbine on an electric power generator.
The best spots that I found for geothermal energy plants are in southern California where there are plenty of hot steam reservoirs, and there is also plenty of space for the plants. Hawaii is also an extremely good spot for geothermal energy plants, because geothermal energy resources are close to the earth's surface.
People can capture geothermal energy through:
- Geothermal power plants, which use heat from deep inside the Earth to generate steam to make electricity.
- Geothermal heat pumps, which tap into heat close to the Earth's surface to heat water or provide heat for buildings.
A geothermal system is three to four times more efficient than the most efficient ordinary system. Because geothermal systems do not burn fossil fuels to make heat, they provide three to four units of energy for every one unit used to power the system. Fossil fuel furnaces have a percentage efficiency rating.
Today, geothermal energy is used in France, Turkey, New Zealand, the United States and Japan, among others. Iceland is one of the biggest users of geothermal energy -- virtually the entire city of Reykjavik is heated with water pumped in from hot springs and geothermal wells. Some cities -- like Klamath Falls, Ore.
Most geothermal resources are near the boundaries of the earth's tectonic plates. The most active geothermal resources are usually found along major tectonic plate boundaries where most volcanoes are located.
Disadvantages of Geothermal Energy
- 1 Environmental Issues. There is an abundance of greenhouse gases below the surface of the earth, some of which mitigates towards the surface and into the atmosphere.
- 2 Surface Instability (Earthquakes)
- 3 Expensive.
- 4 Location Specific.
- 5 Sustainability Issues.
How much land is needed for a ground-source heat pump? Trenches should be at least two metres deep to harness a consistent year-round heat source. They will need 50-80 metres of pipe per kilowatt (kW), or 10 metres of 'slinky' coiled pipe per kW, with at least 5 metre distance between trenches with coils.
The maximum temperature from a heat pump is generally around 50°C, although Kensa High Temperature and Hybrid models are able to deliver hot water to 60°C. The higher the hot water production, the lower the heat pump efficiency.
The main disadvantages of a ground source heat pump are:
- They are expensive to install.
- They are most effective if you have underfloor or air heating systems.
- The installation process will mean significant work and disruption to your garden.
How long does a Ground Source Heat Pump last? A well engineered commercial ground source heat pump can be expected to last 25 years – ten years longer than a combustion boiler – and the ground heat exchanger, the more expensive part of a GSHP installation, should have a life of over 100 years.
The installation of a ground source heat pump or a water source heat pump on domestic premises is usually considered to be permitted development, not needing an application for planning permission. If you live in a listed building or a conservation area you should contact your council to check on local requirements.
The tariff rates are set at 10.18 p/kWh for air to water heat pumps, and 19.86 p/kWh for GSHP with payments made on a quarterly basis for 7 years. If you want an estimation of the ground source heat pump costs, we recommend you to fill out the form on top of this page.
Energy efficiency
Ground source heat pumps are more efficient than air source heat pumps due to the fact that heat is transferred through the ground via the movement of water, and water has a greater capacity to hold heat compared to air.Geothermal heat pumps (GHPs), also known as ground-source heat pumps, can heat, cool, and even supply hot water to a home by transferring heat to or from the ground. This technology has been keeping consumers comfortable for more than 50 years and can cut energy bills by up to 65% compared to traditional HVAC units.
Solar and geothermal are both renewable, but very different in their use. However, for most residential and commercial property owners, geothermal energy can only be used as a heating and cooling solution, while solar energy can generate electricity with photovoltaic (PV) technology.
Geothermal Energy Pros and Cons
| Pros | Cons |
|---|
| Efficient (300- 500% compared to 90% of the best furnaces). | Electricity is still needed to operate heat pumps. |
| Geothermal energy is a renewable resource as long as the Earth exists. | Geothermal energy using wells requires an incredible usage of water. |
Climate Matters
Climate will also dictate whether geothermal is a better option as the farther North you move, the more heat is needed during the winters. Because geothermal energy provides up to 500% efficiency compared to gas or oil heating, it's highly recommended over solar power in colder areas.The national average cost to install a geothermal heating or cooling system is $8,021, with most homeowners spending between $3,381 and $12,723. Including equipment and variable excavation costs, total prices can exceed $20,000. Geothermal heat pumps come in 2 to 6-ton units and average between $3,000 and $8,000.
THAT solar panels do not emit greenhouse gases such as carbon dioxide when they are generating electricity is without question. Silicon is melted in electric furnaces and, at the moment, most electricity is produced by burning fossil fuels.
Geothermal can make sense for new construction, especially in areas where there's no gas hookup.
Because geothermal energy provides up to 500% efficiency compared to gas or oil heating, it's highly recommended over solar power in colder areas.
A geothermal power plant works by tapping into steam or hot water reservoirs underground; the heat is used to drive an electrical generator. Most geothermal plants are located in the western United States, where hot water reservoirs are common.
A solar panel installation can generate electricity for your geothermal heat pump at a comparatively low cost. In terms of energy expenses, you can expect to save as much as 80% each year on hot water, heating and cooling when you switch from an HVAC system to a geothermal heat pump.
