What Is Geothermal Energy? How to Use it at Home

Geothermal vitality generates electrical energy and heats buildings by utilizing warmth saved beneath the earth’s floor. It has gained reputation not too long ago because of its reliability, environmental friendliness, and long-term cost-effectiveness. Such a vitality can be utilized to energy houses and companies in quite a lot of methods.

So what’s geothermal vitality and how will you use it at dwelling? Whether or not you reside in a home in Salem, OR, or a tiny dwelling in Duluth, MN, learn on to find out about geothermal vitality, together with what it’s, the way it impacts the atmosphere, and the way you need to use it to warmth your property.

What’s geothermal vitality?

Geothermal vitality is a renewable vitality supply produced by the pure decay of radioactive parts close to the earth’s core. The warmth then rises to the floor via a strategy of pure convection. Geothermal vitality works by tapping into this warmth supply, both by drilling wells or utilizing a warmth exchanger system buried within the floor. The warmth is then used to generate electrical energy or to warmth and funky buildings.

One other type of geothermal vitality is the steady pure temperature of the shallow underground. 

How will we use geothermal vitality?

There are three main makes use of for geothermal vitality: electrical energy era, direct-use, and GeoExchange programs (geothermal warmth pumps, or GHP). Electrical energy era and direct-use are widespread in business and industrial settings and might help meet the world’s renewable vitality wants. Geothermal warmth pumps, nevertheless, are appropriate for many houses around the globe and might help scale back your environmental footprint. 

Geothermal warmth pumps

Relying on latitude, the shallow floor beneath the earth maintains a temperature between 45 and 75°F year-round, which means it’s typically cooler than the air in the summertime and hotter within the winter. Geothermal warmth pumps make the most of the steady underground temperature by exchanging warmth with the earth to warmth and funky buildings.

Geothermal heating programs are extremely environment friendly and may work on a big scale to effectively regulate the temperatures of many buildings. That is referred to as district heating and cooling (or teleheating). Reykjavik, Iceland, is an efficient case examine for this; at this time, almost your entire metropolis makes use of geothermal vitality to warmth and funky buildings.


Find out how to use geothermal vitality at dwelling

You possibly can set up a geothermal warmth pump to warmth and funky your property year-round. A warmth pump takes benefit of the steady warmth underground by utilizing a sequence of buried pipes. These pipes switch the warmth to a warmth exchanger, which heats or cools the air in your house. Within the winter, the warmth pump removes warmth from the exchanger, and in the summertime, the pump strikes warmth into the exchanger, pushing the warmth underground. 

Warmth pump programs are extra environment friendly than conventional heating and cooling programs as a result of they require much less vitality to switch warmth and are almost immune from environmental components. Additionally they have an extended lifespan and are quieter than different conventional programs.   

Your own home may additionally have entry to geothermal scorching water, which you need to use for home functions. 

Forms of geothermal warmth pump programs

There are 4 widespread sorts of geothermal floor loop programs, every with their very own advantages and downsides. Let’s break them down.

  • Closed-loop horizontal: That is most cost-effective for residential installations the place a considerable amount of land is obtainable. The commonest layouts both use two pipes buried 4 and 6 ft underground, or two pipes side-by-side, 5 ft underground. Pipes are sometimes looped like a vertical slinky to permit for extra pipe in a shorter trench. 
  • Closed-loop vertical: Vertical programs are extra widespread in business settings, resembling companies or colleges, the place house is commonly at a premium. The commonest structure makes use of a number of holes 20 ft aside and as much as 400 ft deep. Looped pipes are inserted into the holes and linked to the warmth pump in the primary constructing. 
  • Closed-loop pond or lake: This may be probably the most inexpensive possibility if in case you have an satisfactory water supply that satisfies minimal quantity, depth, and high quality conditions. In a water-based system, an underground provide line is laid from the constructing to the water. To keep away from freezing, the coils have to be at the least eight ft beneath the water’s floor. 
  • Open-loop: The set up course of entails operating an underground provide line pipe from the constructing to the water supply and coiling it into circles at the least eight ft below the floor to forestall freezing. The coils can solely be positioned in a water supply that meets the minimal quantity, depth, and high quality necessities.

Most closed-loop programs flow into an antifreeze resolution via a closed loop of pipes buried within the floor or submerged in water. Warmth exchangers then switch warmth between the refrigerant within the warmth pump and the antifreeze within the loop.

Take into account your particular person circumstances and wishes, and seek the advice of knowledgeable earlier than putting in a geothermal warmth pump. 

slinky geothermal tubing

Price of a geothermal warmth pump

Geothermal warmth pumps will be costly. A typical residential GHP system can price between $10,000 and $25,000 relying on the location, dimension, and sort of system. Price can even differ relying on components such because the depth of the bottom loops and the complexity of the set up. Nevertheless, this funding can repay within the type of decrease vitality payments over time, as they’re extremely environment friendly and may present important price financial savings in comparison with conventional heating and cooling programs.

As well as, the US presents tax credit to encourage the usage of geothermal warmth pumps in each residential and business buildings.

Execs and cons of putting in a geothermal warmth pump

Geothermal warmth pumps present a sustainable technique to warmth and funky your property. Nevertheless, they do include some drawbacks. Let’s have a look at just a few execs and cons.


  1. Renewable and sustainable: Geothermal vitality is a renewable vitality supply that may exist for so long as the earth exists. It additionally doesn’t produce greenhouse gasses or dangerous emissions naturally. Nevertheless, the extraction course of may cause emissions, and energy vegetation require fossil fuels to construct and preserve. 
  2. Excessive effectivity: Geothermal energy vegetation are extremely environment friendly. They will produce electrical energy 90% of the time, in comparison with 59% for wind and 23% for photo voltaic. This implies they’ll convert a big proportion of the warmth from underground into usable vitality with out a lot wasted warmth.
  3. Dependable and constant: Geothermal energy vegetation can function across the clock and no matter climate circumstances, making them a dependable and constant vitality supply.
  4. Small footprint: Geothermal energy vegetation have the smallest land footprint of any large-scale vitality supply on the planet at simply 404 m2 per gigawatt hour. That is lower than one-third the quantity of a median wind farm. 


  1. Excessive upfront price: The price of putting in a geothermal warmth pump is increased than conventional heating programs because of the want for drilling and putting in underground piping. Completely different programs price completely different quantities, however the commonest sort is a closed-loop horizontal system.
  2. Web site suitability: Geothermal warmth pumps require appropriate geology and land space to put in the underground loop system, which might not be obtainable in all areas.
  3. Set up challenges: Putting in an underground loop system requires specialised gear and experience, which might pose challenges throughout set up and upkeep and result in increased prices. Completely different programs require 

How lengthy have individuals been utilizing geothermal vitality?

Individuals have been utilizing geothermal vitality for 1000’s of years. Listed here are two examples: 

  • Scorching springs: Since at the least 10,000 years in the past, native peoples in North America have been utilizing them for cooking, bathing, rest, and medical remedy, amongst different makes use of. 
  • Warmth era: Individuals have used geothermal vitality to warmth inside areas for 1000’s of years, courting again to at the least the 1st Century CE. Nevertheless, it wasn’t till the late nineteenth century that the primary geothermal district heating system was in-built Italy to warmth and funky a whole city.


Ultimate ideas on geothermal vitality

As local weather change persists, investing additional in renewable vitality, like geothermal, is crucial. Geothermal vitality is dependable, emits little to no greenhouse gasses, and has quite a lot of makes use of and large development potential. Nevertheless, the method of drilling and exploration will be costly and environmentally dangerous.  

Owners can use geothermal warmth pumps to warmth and funky their houses effectively. These programs use the steady temperature underground to supply warmth through the winter and cooling through the summer time. 

Whereas geothermal vitality is much less widespread than different forms of renewable vitality, it will probably play an necessary function in decreasing carbon emissions and assembly international vitality calls for.

Back To Top