The Biden administration is rethinking how homes are heated and cooled in the US, eyeing a tried-and-true, but thus far underutilized, climate solution to reduce planet-warming pollution and save homeowners money on energy costs.

To do it, the Department of Energy is tapping 11 communities around the US to spend the next year designing projects to harness below-ground, geothermal energy to heat and cool homes, libraries, community centers and other buildings.

On Tuesday, DOE will announce that the communities – which range in size from New York City to Nome, Alaska – have received the first round of funding to help them reimagine how our homes stay comfortable. Geothermal heating and cooling could eventually be brought into homes and buildings using heat pumps, which are highly efficient appliances that circulate warm or cool air through buildings, according to the department.

“That heat pump is basically run from heat in the ground,” Arlene Anderson, project manager for DOE’s Geothermal Technologies Office, told CNN. “The fuel is basically the Earth source heat.”

It’s part of a multi-year, $13 million project to explore how geothermal heating and cooling could be applied not only in rural areas but densely populated cities. After their year-long design phase, DOE will select a smaller number of these projects to fully fund and deploy. Details of the project were shared first with CNN.

In the long run, the effort could help communities transition away from heating and cooling with energy from planet-warming fossil fuels. Residential energy use accounts for around 20% of the country’s climate emissions, and a large portion of that is from energy used to heat and cool homes.

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