Gradient Comfort, which works on better ways to approach HVAC, announced that it had extended a Series-A round and brought in an additional $9 million for a total of $27.5 million.

Leading the round was Climate Investment (CI), a specialist decarbonization climate investor. Cindi Bough, Managing Director Ventures at CI, will join the Gradient Comfort Board and Rick Cutright, Technology Director at CI will join as an observer.

"With 30% and 50% of the energy footprint of U.S. buildings and homes, respectively, coming from heating and cooling, it is essential that buildings have carbon neutral solutions that are effective and affordable," a company press release quoted Cindi Bough as saying. "Heat pumps are increasingly recognized as a critical technology for buildings' decarbonization. Innovations are needed to lower purchase and installation costs, reduce complex renovations, improve energy performance, and leverage heat pumps for grid and flexibility. We believe Gradient Comfort's solution suite delivers on all of these elements."