Geothermal heat pumps have the greatest upfront cost of any home heating system

Among renewable sources, geothermal rivals hydropower in lifetime cost

As of 2024, the levelized cost of energy—the average cost per unit of energy over the lifetime of a power plant—for geothermal power is surpassed only by solar photovoltaic and onshore wind. Geothermal's LCOE has remained relatively unchanged since 2007, with significant decreases held back by significant upfront installation costs.

Geothermal power can generate electricity and provide direct heating for homes

By drilling several kilometers through penetrable rock, wells can access highly pressurized groundwater warmed by thermal energy trapped beneath Earth's surface. This water can be turned into steam to create electricity in generators. Heating systems several meters deep can pump fluid underground before circulating it through buildings.

Heat pumps use an easily boilable chemical to regulate temperature

In air conditioners, warm air is pulled from a home to turn a refrigerant into a gas, which is then compressed, raising its temperature. The gas naturally releases this energy to the comparatively cooler environment when exposed, then expands and is reused in the system. Heaters run in reverse, with the refrigerant picking up energy from the comparatively warmer environment.

Geothermal power may meet 15% of global electricity demand growth through 2050

According to the International Energy Agency, the estimate would require the construction of geothermal capacity with an annual output equivalent to the combined electricity consumption in the US and India in 2024. The report suggests geothermal investment will reach $2.5T by 2050, with the integration of fracking technologies decreasing costs by 80% by 2035.

Explore next-generation geothermal projects worldwide

This tool from the Clean Air Task Force allows users to see the location of geothermal power systems to depths of 12.5 kilometers (7.8 miles), where temperatures reach about 450 degrees Celsius (842 degrees Fahrenheit), including proposed, abandoned, and in-development projects.

Humans have used geothermal resources for thousands of years

In North America, Indigenous peoples viewed hot springs as sacred places and used them for medicinal purposes, cooking, and surviving cold weather. The ancient Greeks and Romans also viewed them as sacred, partaking in hot mineral baths to relieve ailments and using them for space heating.

Ranking the most expensive appliances on your electricity bill

Energy costs have gone up amid war and inflation. Here's a breakdown on the cheapest and most expensive appliances in your home to help you lower your bill.

Many of Wright's buildings used radiant heating

Frank Lloyd Wright’s buildings weren’t just radical because of how they looked, but many of them also incorporated stunning technological innovations. Radiant heating is one of Wright’s most popular heating systems, offering the comfort of walking on warm floors on a cold day.

A basement of mechanical systems—collectively called the technosphere—supports B2

Twenty-six underground air handlers heat, cool, filter and manage the humidity of the air across the biomes of Biosphere 2. The above-ground Energy Center complex provides continuous power to these and other systems, including heating and cooling water for laboratory experiments and personal use.

Home energy performance can be boosted through home orientation and shading

When designing a home, placing living areas to the north maximizes sun exposure during winter, while eaves and awnings can limit excessive summer heat. Breezeways and entry air locks can also reduce the dependence on heating and cooling costs.

The Geysers is the largest geothermal power complex in the world

Despite the Mayacamas Mountains area north of San Francisco lacking geysers, the name given by a grizzly bear hunter stuck after the construction of The Geysers Resort Hotel to accommodate tourists. Natural steam vents in the region are funneled into more than 12 geothermal plants, each capable of powering about 40,000 homes.

Certain home renovations, such as installing an in-ground pool, could increase your property taxes

Significant home improvement projects like adding another bathroom or an addition might raise your tax bill if they significantly increase the value of your home. The amount your tax bill could increase by depends on how tax assessment procedures work in the home’s location, as they vary by locality.

Hawaiians must earn higher annual salaries than anywhere else in the country—roughly $229K—to purchase a typical home

This map of the US shows the annual income required to purchase a typical three-bedroom home in each state. This is based on a 10% down payment, a 6.65% interest rate on a 30-year fixed mortgage, and a 30% income-to-housing cost threshold, including taxes and insurance, according to recent data from Realtor.com. According to the data, Hawaii is the state where you'd need the highest yearly income.

Establishing the wind power grid required incentives, reliability, and affordability

Although wind was harnessed to generate electricity for individual buildings in the late 1800s, high costs, mechanical issues with turbines, and better fossil-fuel alternatives delayed wind power's widespread growth. After the oil crises of the 1970s, governments sought alternative energy sources and, in the decades that followed, provided tax credits to expand the wind power market.

US housing costs have risen by roughly 175% between 1991 and 2026—but a growing number of Gen Zers are becoming homeowners anyway. In 2025, 4% of homebuyers were Gen Z, up from 3% the year before.

Massive 3D printers have been used to build homes by stacking layers of 'concrete toothpaste,' a fire-resistant material that effectively insulates against outside noise.

Fluorinated molecules are the most impactful, longest-lasting greenhouse gases

Developed as replacements for ozone-depleting substances in refrigeration and air conditioning systems, these compounds are released through leaks in and ongoing use of these appliances, as well as from various industrial processes. They can remain in the atmosphere for thousands of years and have warming potentials that are a thousand to tens of thousands of times greater than those of carbon dioxide.

Listen to the evolving economics of prosthetics

Amputees must navigate the challenging medical and economic aspects of limb support and replacement, but advances in technology and research may reduce these costs. A below-knee prosthetic typically costs $15,000 to $20,000—not counting all the rehab costs.

Artificial Christmas trees can range from about $85 to $1K or more

In 2022, 22.34 million real Christmas trees were purchased and sold at a median price of $80. Even so, from a price standpoint, a fake tree is usually the less expensive option in the long run, as they're reusable and can save time and maintenance.

Flood insurance policies from the National Flood Insurance Program cost just over $1,100 per year on average

Private residential policies range from $600 to $2,800 per year. Taking steps to lower flood risk in your home, such as installing flood vents or elevating home utilities, can make premiums cheaper.

Massive 3D printers have been used to build homes by stacking layers of 'concrete toothpaste,' a fire-resistant material that effectively insulates against outside noise.

Experts recommend putting aside between 1% and 4% of the home’s value for maintenance

Experts say homeowners should consider the home’s age and condition, and its location’s climate, when deciding exactly how much to put aside for repairs and maintenance. They also recommend setting aside more money for those who expect to hire others for home repairs rather than doing it themselves.

The economics of ski resorts

More than 480 ski resorts pack in nearly 65 million visitors each year in the US for historically high prices. Daily lift tickets may cost three figures at many locations. Amid industry consolidation and more stringent land use regulations, ski resorts are upping their prices—a factor that does not appear to be dampening the sport's popularity. Learn more here.

Graduate/professional schools often cost more to attend than undergraduate schools

Grad and professional school cost more than undergraduate schools. Individuals with advanced degrees owe many times more than graduates with bachelor’s degrees. For example, the average student debt held by a PhD was around $125K in 2023, while those with undergraduate debt averaged $37K.

George Westinghouse purchased Tesla's AC technology patents for $60,000

The seven patents in alternating current motors and power transmission formed the basis for a system of technologies including generators, transformers, and lighting. Nikola Tesla spent half the funds on a new laboratory to develop new inventions.

Heatstroke deaths may be massively undercounted—perhaps by a factor of 10

One often-cited average estimate of annual American heat deaths—roughly 1,200 per year—is based on death certificate data, but it may be a significant undercount because heat kills through cardiovascular, kidney, and respiratory causes that are more likely to be cited on those documents. (Separate analysis that looked at data from 1999 to 2023 found that the highest number, in 2023, was 2325.)

Some renewable energy sources may weaken the resiliency of electric grids by removing outage buffers provided by coal- and natural gas-fired plants, which provide the system with more time to find a new power source if a plant goes down.

Canada Goose jackets can cost upward of $1K

Canada Goose winter jackets have become status symbols of sorts in chilly cities all over the United States. But the brand wasn’t always considered luxury. Originally, Canada Goose was a little-known manufacturer of utilitarian outerwear. This video shows how the retailer went from selling coats for the working class to selling coats to the 1%.

The boiling temperature of water decreases with increasing elevation because the molecules need less energy to overcome the lower atmospheric pressure associated with thinner air.

Before the current East Wing ballroom project, only two White House renovations in the past 100 years cost more than $10M.

The price of gas is a composite made up of several different factors, with the federal gas tax making up less than 20% of what drivers pay at the pump.

The history of many kitchen appliances involves unexpected discoveries and applications, including wartime radar turned hamster defroster and replacing an 'ice king' with heat-stealing boxes.

Frank Lloyd Wright's houses are historically hard to sell because they're old, subject to local landmark commissions, and often unfashionable

About 2,000 US babies are born annually without some portion of their limbs, potentially leading to a lifetime of pricey prosthetics.

The 1987 Nintendo video game 'Stadium Events' isn't known for being particularly fun, but its scarcity has made it a highly sought-after item that has sold for up to $35K at auction.

The deadliest aspect of volcanic eruptions is often not lava, but pyroclastic flows—avalanches of ash, gas, and rock that can move more than half the speed of sound.

How fusion—which releases energy when two lighter atoms combine to form a heavier atom—differs from fission

Venture capital is a form of funding provided to early-stage companies with high growth potential, typically in exchange for an equity (or ownership) stake

Use this calculator to find the dollar value of your mental load, from meal planning to coordinating after-school care for your children.

A pickleball's loud 'pop' sound can reach 120 decibels, which is equivalent to a hammer hitting a nail

Scientists testing how climate change affects plants found, in a years-long simulation study, that poison ivy grew 70% faster with the resulting extra carbon dioxide.

Stanford built a Google Maps for the Roman Empire, revealing how much it cost to travel in the ancient world

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

See the 25 of the best photos of auroras from around the world.

While the sun's gravity keeps the planets in orbit, their gravity also pulls on the sun, causing it and everything else in the solar system to orbit around a mutual balance point called the barycenter—the true center of the solar system.

Watch how deep-sea mining equipment collects and processes polymetallic nodules—metal-rich, potato-shaped rocks—from the ocean floor and creates environmentally damaging plumes of sediments.

See photos of Meteora, a mountainous site in central Greece, home to 14th-century monasteries perched atop soaring outcroppings.

Double world record holder Hunter Ewen helped conquer his fear of balloons, called globophobia, by training to win Guinness World Record titles for balloon inflation.

The Russia-Ukraine conflict is the largest ground war in Europe since World War II in terms of casualties, forces mobilized, and displacement of civilians.

The syncytiotrophoblast is the outer layer of the placenta and the largest human cell, spanning an area about twice that of a king-sized bedsheet.