Factories spend $1.2 trillion a year on industrial heat, 2,600+ investors have already backed Airthium, and this is your unique opportunity to invest too. Join the round now, or book a call to ask your questions first.
The call is free, 20 minutes, direct with cofounder Franck Lahaye. Limited slots each week.
Rated 4.9/5 · Top Deal by KingscrowdFactories don't run on electricity. They run on heat, and almost all of it comes from burning fossil fuels. Between 150°C and 550°C, clean options have a hard time beating gas on price. That's the gap Airthium is built for.
Normal heat pumps stop around 150°C. Airthium's machine is designed to reach 550°C. That's hot enough for food, chemicals, and most of industry. It runs on electricity when power is cheap, and lets the factory's gas boiler take over when it's not.
The actual prototype on its test bench. Real machine, not a render.
Normal heat pumps stop around 150°C. Airthium is designed to go much hotter, in the range where factories actually need heat.
The machine runs on helium. It's safe, doesn't burn, and doesn't warm the planet. No chemical refrigerants, no regulatory headaches.
Software recalculates the cheapest energy source every 15 minutes. Electricity when it's cheap, gas when it's not. The factory never stops.
“We go after much higher efficiency so that by the time others have evangelized the market, we come in with a solution that's strictly better on the metrics that matter.”
Andreï Klochko, cofounder & CSO. PhD in plasma physics, École Polytechnique. He designed the engine at the core of Airthium's technology.
Clean only wins if it's also cheaper. The engine targets up to 3x the efficiency of an electric boiler, and a heat cost lower than every option we've compared, including gas.
Company estimates. Results depend on the site.
This is an early-stage bet. The risks are real, and so is the prize. Here it is in plain words.
Factories spend about $1.2 trillion a year on heat, and carbon rules get stricter every year. Whoever sells clean heat for less than gas wins a giant market.
Investors have put hundreds of millions into clean industrial heat. Airthium works on the hardest part, 150–550°C, and is still early. You get in at the ground floor, with ground-floor risk to match.
The engine can run in both directions. Today it makes heat. Later, it could store cheap power for the grid. Two markets, one machine.
Natural acquirers in this space include industrial giants like Siemens, Schneider Electric, Bosch and Atlas Copco, as well as energy companies and infrastructure funds. No outcome is guaranteed.
The audience voted Airthium the winner at Kingscrowd's Q3 2026 Demo Day. Kingscrowd, the leading private investment data platform, also rated Airthium a Top Deal, and its own fund, Kingscrowd Capital, invested in the round.
The momentum shows on the leaderboard too. Out of 330+ companies raising Reg CF in one week of August 2026, Kingscrowd ranked Airthium Top 5 most raised on Wefunder and #15 across all platforms nationwide.
“I think what they're doing is amazing and very much a revolutionary technology.”
Chris Lustrino, CEO of Kingscrowd
When you invest in a startup, you're investing in the team as much as the business. That's why Franck, who has run Airthium's business side for nine years, makes time for a 20-minute call with every investor who wants one.
You're not investing in a page. Meet the team you'd be backing.
Airthium has worked on this machine since 2016, holds one granted patent with a second filed, and has been backed by some of the most selective investors in tech, plus thousands of individual investors.
Named investors participated in Airthium's previous financing rounds. Their inclusion is historical fact and does not imply endorsement of the current offering. Investor quotes are individual opinions from previous rounds, not a promise of results.
Real machines take time to build. Here is where the company stands today, and where it's going.
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