How Dandelion is making geothermal heating affordable


Millions of US citizens still use oil and natural gas to heat their homes during the winter. Many would like to switch to geothermal, a cleaner and ultimately cheaper system that leverages the natural temperature of the earth. A few feet below the surface, the soil sits at a reliable 50- to 60-degree Fahrenheit all year round. Pipes known as 'ground loops' push round a special antifreeze solution that absorbs this constant temperature in winter and disperses unwanted warmth in the summer. A large indoor heat pump uses the mixture to boil a refrigerant fluid; the resulting gas is then compressed to higher temperatures and distributed around the home.

Installing the necessary equipment is expensive, however. Dandelion, a company that started inside Alphabet's X division, is trying to make geothermal cheaper and easier to install. While not the most eye-catching technology, especially compared to electric cars and sea-cooled data centers, it's arguably one of the most important for the environment.

(Read more on Engadget)