“We want to … be nationwide,” said Gunnison, a former general contractor and an MIT-trained engineer who once worked on satellite communications and remote imaging at NASA.
To achieve that scale, Zero Homes relies on partnerships with independent installers that it subcontracts with. Currently, the company operates in Colorado, Massachusetts, Minnesota, Illinois, and California.
Zero Homes’ approach has gained some traction. The U.S. Department of Energy validated the startup’s remote assessments in 2024, Gunnison reported. The Air Conditioning Contractors of America also that year approved the startup’s software as a tool to perform the organization’s trademark Manual J calculations remotely.
Gunnison declined to share whether the company was profitable, but he did say that its revenue had grown by a factor of 10 from 2024 to 2025. Customer service calls on the installations it has managed are “very low,” he added. And Zero Homes’ installer network has expanded to nearly 100 contractor businesses.
“We get rid of a lot of the overhead that costs them a lot of time and heartache, so that they can be successful,” Gunnison noted. “We don’t charge them for leads , [we] fill their calendars.”
A number of utilities and power co-ops, including ComEd, Great River Energy, and Tri-State Generation and Transmission Association, have hired Zero Homes to deploy heat pumps in their service territories. A couple of local governments have also expressed confidence in the company: Chicago partnered with Zero Homes as part of its Green Homes program, and Colorado is giving the business a $745,000 boost through its economic development office to expand its Denver-area operations.
Several other startups around the country are specializing in heat pump installations, such as Elephant Energy, Tetra, Forge, Quilt, and Jetson — which recently raised $50 million to get its in-house-designed heat pump into more buildings.
Gunnison plans to use the new infusion of capital to double his company’s 25-person headcount this year and improve its software capabilities, he said.
It used to take Zero Homes several days to provide a quote to a homeowner who had submitted a scan. Now that process is complete in about one day. By the end of 2026, the startup aims to slash that time to 30 minutes, Gunnison noted.
“Once we can consistently deliver that, then we will very, very rapidly expand geographically.”