Legence

Somewhere right now, a data center is running hot. A hospital wing needs its air handlers replaced without shutting down a single operating room. A chip fab needs ultra-pure process piping installed to a tolerance most people will never see. None of this makes headlines. All of it is what Legence does for a living.

Legence is North America's largest pure-play building performance platform. Translated out of investor-speak: it designs, builds, fixes, and finances the guts of complicated buildings - the heating, cooling, piping, power, and controls - and it does so with an explicit goal of cutting the carbon and the utility bill at the same time. Roughly 10,000 people, more than 70 offices, 50,000 projects a year. Over 60% of the Nasdaq-100 are customers. You have almost certainly been inside a building Legence touched. You just had no reason to know it.

Buildings account for a large share of global energy use and emissions. Everyone in the industry knows this. The awkward part is that fixing a building has long meant assembling a small army of strangers: one firm to advise, another to engineer, a contractor to build, a separate crew to maintain, and a bank to pay for it. Each handoff loses time. Each handoff loses information. The result is a process that is slow, expensive, and oddly good at producing buildings that still waste energy.

That fragmentation is the tension Legence exists to resolve. The pitch is almost suspiciously simple: put advisory, engineering, fabrication, installation, financing, and maintenance under one roof, and the seams stop costing you. The company claims its integrated delivery model can shave up to 20% off the total time of a project - the unglamorous span of designing, planning, building, and measuring.

Here is the part that is easy to miss. Legence is not a startup that learned how to swing a wrench. It is the opposite - a deeply experienced trades-and-engineering business that learned how to tell a climate story. The company traces its roots to 1967, when it was known to San Jose locals simply as Therma. For five decades it did exactly the kind of HVAC and mechanical work that keeps the lights on and the air cold.

In 2020, Blackstone bought the business. In 2022, it rebranded Therma Holdings as Legence and called it the world's first "Energy Transition Accelerator." The bet, led by CEO Jeffrey Sprau - a veteran of Johnson Controls and Trane - was that the energy transition would need far more than software and slide decks. It would need people who actually know how to install a chiller. Sprau inherited a historic Silicon Valley company and turned it toward decarbonization, then grew it by absorbing regional engineering and sustainability firms one acquisition at a time.

What Legence actually sells is the absence of friction. Instead of hiring a chain of specialists who blame each other when a project slips, a customer hires one platform that owns the whole arc - from the first energy model to the last service call. For mission-critical facilities, where a day of downtime is measured in millions, that single point of accountability is the product.

Skeptics are right to ask whether "Energy Transition Accelerator" is a strategy or a slogan. The financials offer the most honest answer Legence has. The company put up $2.55 billion in revenue for fiscal 2025 and walked onto the Nasdaq in September of that year. The client roster - more than 60% of the Nasdaq-100 - is the part that is hard to fake.

Legence's stated mission is to deliver high-performance buildings through an integrated approach and genuine technical depth. Its vision goes a step further: a world where energy-efficient, healthy, resilient buildings are the default, not the showpiece. That is an ambitious thing to want, mostly because winning means becoming invisible. Nobody throws a parade for a chiller that runs 15% more efficiently. The mission is to make excellence so routine that it stops being remarkable.

There is a quieter argument underneath it, too. The energy transition is often imagined as a story about new things - solar farms, batteries, hydrogen. Legence is a reminder that an enormous chunk of the work is about old things: the millions of buildings that already exist and leak energy every hour. Retrofitting them is unglamorous, capital-intensive, and absolutely necessary.

Return to where we started. The data center running hot. The hospital that cannot go dark. The chip fab measured in microns. The demand for all three is climbing - AI alone is sending data center energy needs sharply upward - and every one of them needs someone who can build complex, efficient, mission-critical systems fast and keep them running. That is the market Legence has spent nearly sixty years quietly preparing for.

The work will never be glamorous. It will never trend. And that is precisely the point. Legence took a half-century-old HVAC company, gave it a balance sheet and a mission, and turned the most overlooked corner of the climate problem into a public company. The buildings still hum along in the background. They just waste a little less while they do it.