Jeffrey
& the Boiler Room

The man behind the thermostat.

There is a building near you right now - a hospital, a chip fab, a hyperscale data hall in some county nobody visits - whose chilled-water loop is humming a few degrees cooler than it was last Tuesday. Somewhere upstream of that small mercy is a 6,300-person company called Legence. Somewhere upstream of Legence is Jeffrey Sprau, the CEO, who would rather talk about that loop than about himself.

Sprau took Legence public on Nasdaq in September 2025 at $45 a share, under the ticker LGN. The pitch to investors was unfussy. Buildings burn an enormous share of the country's energy. The tools to make them burn less - mechanical retrofits, controls, prefabrication, building analytics, energy procurement - already exist and are mostly sold by middle-market contractors with regional accents. Roll up enough of them, train them on the same playbook, and you have a national platform for the energy transition that happens to look, on the surface, like a really large HVAC company.

That is the Legence trade. It is also, in a way, the Sprau trade. He has been building toward this exact shape of company for most of his working life. He just had to do a few other jobs first.

Iowa State, then a marketing engineer at Trane.

Sprau studied industrial engineering at Iowa State from 1983 to 1987, then went to Mercer University's Stetson-Hatcher School of Business in Macon, Georgia, for an MBA in marketing management. The combination - engineer who can sell, salesperson who can read a P&ID - turns out to be the rarer of the two halves of his resume, and the half that explains a lot of what came next.

His first real job was as a marketing engineer at Trane. He stayed inside the HVAC industrial complex - Trane, then Johnson Controls, then Trane again - for more than twenty years. People who spend that long in branch-based service businesses come out either bitter or fluent. Sprau came out fluent. He understood, intuitively, that the unit economics of a mechanical services company live or die on the route density of its service techs, the standardization of its install crews, and the patience of its capital.

In 2011 he jumped to Safway, the scaffolding and access-services company, where he ran first the East Division and then the U.S. Division. By 2017 he was president of BrandSafway's Commercial & Industrial business, a $1.8 billion operation. By his own account this was the period in which he stopped being an HVAC guy and started being an operator of large, distributed, blue-collar businesses - which is the actual job description at Legence, even if the marketing deck says otherwise.

April 2019. San Jose.

Therma was a sixty-year-old California mechanical contractor with a strong reputation in semiconductor cleanrooms and a campus on Las Plumas Avenue. In April 2019 it announced that Jeffrey Sprau, lately of BrandSafway, would be its new CEO, and that longtime executive Steve Hansen would be promoted to president alongside him. The press release was the kind nobody outside the trade reads, which is exactly why the moment matters: Sprau didn't show up as a celebrity hire. He showed up as a closer.

What followed was a quiet reordering. Within eighteen months, Blackstone had taken a majority stake in Therma's holding company and rolled additional building-services businesses underneath it. In October 2020 Sprau was named CEO of the parent, then called Legence Parent LLC. In 2022 the platform formally took the Legence name and launched itself as, in its own coinage, "the world's first Energy Transition Accelerator." The same year, Legence picked up Black Bear Energy, an owner-side renewables advisor for commercial real estate, signalling that the company intended to advise on, finance, install, and service the carbon out of buildings - not just any one of those.

By the time Legence Corp. filed its S-1 and rang the Nasdaq bell in September 2025, Sprau had been running the platform for five years. He was named CEO of the public-company entity in January, and added to the board in August. The IPO priced at $45. The deck, mercifully, did not use the phrase "AI-native."

The conviction problem.

If you listen to Sprau in interviews and at industry roundtables, the same idea comes up like a metronome: the bottleneck on decarbonizing buildings is not technology, it's resolve. He has been quoted saying that "the policy landscape is evolving rapidly and the time to act is now," and warning commercial real estate owners that jurisdictions with Building Performance Standards are about to start handing out real fines. He frames the built environment as one of the country's largest greenhouse gas emitters and one of its most behind-schedule, which is a fairly aggressive thing for a contractor's CEO to say in public.

It is also a useful thing to say. Legence sells the solution to the problem he is describing. The honest version of the trade is this: if regulators do their job, every line item Legence sells - the retrofit study, the controls upgrade, the prefabricated mechanical room, the ongoing tune-up contract - becomes less optional. Sprau is one of the few CEOs in his sector who will say the loud part out loud.

Where the electrons actually go.

Ask Sprau about the most interesting customer on Legence's roster and the answer tends to drift toward data centers. He has used industry features, including in Commercial Property Executive, to argue that operators of large compute campuses should treat energy efficiency the way they treat uptime - as a default, standardized engineering discipline rather than a green initiative bolted on at the end. It is a point that lands harder every quarter, as the AI buildout pushes utilities into the kind of capacity conversations they last had during the postwar industrial boom.

Legence has been positioning itself to be the contractor that gets called when a hyperscaler decides that buying its way out of an interconnection queue with efficiency is cheaper than waiting on a substation. That position - boring, technical, indispensable - is the one Sprau has been preparing for his entire career.

What he is not.

Sprau is not a thought-leader CEO in the modern, performative sense. His LinkedIn presence is sparse and on-brand. He posted, in early 2024, an essay titled "From Boiler Room to Boardroom" reflecting on the long arc from field engineer to public-company CEO; it reads less like personal mythology and more like a service manual. He has shown up at Al Gore's Generation Investment Management roundtable on commercial-real-estate decarbonization, sitting next to Legence's chief sustainability officer Deb Cloutier, then quietly returned to running the company.

His title list - CEO of Legence Corp., CEO of Legence Parent LLC, director, member of the Fast Company Executive Board - is the kind of stack you accumulate when you keep saying yes to operating work. He lives in San Francisco, runs a company headquartered in San Jose, and apparently still spends a meaningful share of his time inside customer buildings, which is the cheapest possible signal that the engineer in him outranks the CEO in him.

The interesting part.

The interesting part of Jeffrey Sprau is not the IPO. The IPO is a milestone, and milestones are easy to write about. The interesting part is the bet underneath the milestone: that a publicly traded American mechanical-services roll-up can be a credible climate company, valued and traded as one, rather than as the boring industrial cash cow Wall Street has historically priced it as. If that bet works, Legence stops being a contractor and starts being a category. If it doesn't, Sprau will, by his own demonstrated pattern, just keep retrofitting buildings.

The thing about a man who has spent his entire career in branch-based service businesses is that he has no romance about disruption. He has a route map, a service crew, and a backlog. He believes the backlog is going up. He may well be right.