Kathy Hannun Went Looking for a Moonshot. She Found It Under the Lawn.

Before Kathy Hannun thought about changing the furnace, she knew the truck. In New Hampshire, where she grew up, a heating-oil delivery arrived before winter with a smell strong enough to become a childhood memory. The ritual was ordinary: cold weather, a tank in the house, a vehicle carrying fuel that would be burned to keep the rooms warm. Years later, after civil engineering, computer science and a long detour through Google, Hannun would return to the household boiler with a product manager’s suspicion. Perhaps the dull appliance in the basement was not merely an appliance. Perhaps it was the hinge of a much larger system.

Her answer became Dandelion Energy, the company she began inside Alphabet’s X lab and spun out in 2017. The company installs and supplies geothermal heat pumps: indoor equipment connected to pipes buried deep enough to exchange heat with ground that stays at a far steadier temperature than the air. In winter, the system collects heat. In summer, it sends heat back. No backyard volcano is required. The shallow ground is essentially a dependable thermal reservoir, and the machinery moves heat rather than making it through combustion.

None of this was new when Hannun encountered it. That was precisely the attraction. Geothermal heat pumps already worked. They were efficient and durable. They were also sold as elaborate, bespoke construction projects, priced accordingly and delivered through a jumble of drillers, HVAC contractors and designers. The neglected invention was not a scientific principle. It was a way to make the whole contraption feel like one product.

The job that was supposed to last a year

At Stanford, Hannun knew she wanted to work in water or energy. She earned a bachelor’s degree in civil engineering in 2009, then found the first-career paradox waiting for her: employers wanted experience before they would provide it. Google was hiring. She joined in customer support, expecting a useful year before returning to environmental work.

The year became seven. She learned the company from the service desk upward, eventually moving into product management at X, Alphabet’s laboratory for high-risk technology businesses. There she evaluated early projects and worked on Foghorn, an attempt to produce carbon-neutral fuel from seawater and renewable hydrogen. The technology functioned, but its economics and risk did not make a convincing business. X was a place where killing an elegant idea could be as important as nurturing one.

A colleague, Bob Wyman, then made the case for geothermal heat pumps. The claim was audacious: this mostly ignored category could be among the most consequential ways to cut American building emissions. The evidence held Hannun’s attention. Home heating was an enormous market, the customer could save money, and the technical obstacles looked addressable. This was not a request to discover a new particle. It was a request to improve drilling, equipment, software, sales and installation at the same time. In other words, an excellent way to ruin a quiet afternoon.

A weed with excellent product semantics

The company’s name came from a lesson with a naming expert. Most heating businesses choose something literal: a surname, a town, perhaps the word “mechanical” in sturdy capitals. Hannun wanted something more playful. A dandelion has a taproot that extends well below its bright, changeable top. Cut the flower and the root can produce another. A geothermal heat pump will eventually wear out; the ground loops can remain useful for the life of the home. It was botany doing brand strategy.

The metaphor also captured the strange asymmetry of the product. Nearly everything important is invisible. The ground loop does its work under the yard. The heat pump replaces equipment already hidden in the basement. The homeowner notices the absence of an oil delivery, an outdoor condenser or a familiar bill. Good infrastructure is often impolite to photograph.

The moonshot meets the farmers market

X gave the idea a rare beginning: mechanical engineers could work on drills and heat pumps while software engineers considered monitoring and controls. But home services require contact with homes, not only prototypes. Dandelion’s needs were different from those of an Alphabet-scale autonomous car project. The team wanted to put equipment in yards, learn quickly and control its own operating tempo. Hannun took the project outside.

New York offered cold winters, expensive heating fuels and dense clusters of likely customers. Hannun moved east and did the unmoonshotlike work of market validation. She stood at farmers markets and outside coffee shops, explaining geothermal to people who had not arrived hoping to discuss boreholes. The company raised a $2 million seed round and began installing. The distance between a laboratory thesis and a muddy lawn proved educational.

One lesson concerned responsibility. Dandelion initially expected local contractors to sell and install systems. The arrangement looked scalable on a slide. In practice, those steps were too central to price, quality and the customer experience to leave at arm’s length. The company brought more of the process in-house. Hannun later described inertia as the primary competitor: when a boiler fails, the familiar installer recommends familiar equipment. Breaking that loop required a complete alternative, not an interesting component.

Learning to leave the chief executive’s chair

Hannun’s founder story includes an unusually public willingness to describe what she learned late. She has said she should have sought mentorship earlier and spent less time trying to rescue poor performance. Dan Yates, who built energy-efficiency software company Opower, became an important mentor and eventually a Dandelion board member and CEO. In 2020, Hannun handed off the chief executive role and became president, concentrating on the work she preferred: research, product and engineering. Today Dandelion lists her as founder and CTO.

Her description of leadership is facilitative rather than theatrical. Assemble the right people, ask the questions that expose the decision, and let expertise do more of the talking. It fits an enterprise where geology, HVAC, electrical panels, software, public policy and consumer finance have to agree before a family feels warm. No solitary visionary can outvote the ground.

The formal recognition accumulated: Fast Company’s Most Creative People in Business in 2018, MIT Technology Review’s Innovators Under 35 in 2019, a TED Fellowship and the U.S. C3E Entrepreneurship Award in 2020, then CNBC’s inaugural Changemakers list in 2024. Useful honors, all of them. None can drill through granite.

From the yard to the neighborhood

The newest version of Hannun’s thesis changes the unit of adoption. Retrofitting one home at a time means finding each customer, surveying each property and bringing a rig into a finished landscape. New construction lets the loop go in before the lawn, the driveway and the moving van. A builder can make one specification across a development. Repetition turns bespoke work into production.

In 2025, Dandelion and Lennar announced plans to install geothermal systems in more than 1,500 new homes across 14 Colorado communities over two years. Dandelion had also designed its own Geo heat pump, developed an authorized-installer network and raised a $40 million Series C led by GV. A leasing program attacked the old enemy from another side: the upfront cost. Hannun said the arrangement marked the first time geothermal did not cost more than conventional heating and air conditioning for a major American homebuilder.

The shift is pragmatic environmentalism in company form. Hannun does not expect a household to accept a worse bargain as penance for having a furnace. The cleaner product has to be less expensive, simpler or better - preferably all three. She calls HVAC and drilling “less charismatic” problems. The phrase is both affectionate and strategic. Fashionable fields attract talent and capital; neglected ones preserve room for a patient engineer who does not mind learning about manifolds.

Nearly ten years after the spinout, Hannun’s moonshot looks less like science fiction than a supply chain. There are drill crews to train, borefields to design, builders to persuade, incentives to understand and equipment to monitor. This is progress with work boots on. Its most durable evidence may never be seen again once the trench is closed.

That childhood oil truck made heating visible for a moment each winter. Hannun’s ambition is to replace the delivery with something quieter: a loop below the grass, a machine in the basement and a home exchanging heat with the earth beneath it. The dandelion on top is optional.