Airthium
YC S17Paris, FR · Founded 2016 · 18 employees · 5 known investors
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Airthium manufactures high-temperature industrial heat pumps that reach up to 550°C and operate in hybrid mode, switching between electricity and gas to optimize cost and carbon emissions. The system is designed for industrial process heat applications requiring reliable 24/7 operation in the 150–550°C range.
Founders & leadership· Y Combinator alumni (S17)
Airthium was founded in 2016 by Andrei Klochko and Franck Lahaye.


Investors · 5
How we know: Daphni's portfolio page · funding news · Not right? Tell us
How we know: Polytechnique Ventures's portfolio page · open dataset · 5k.vc investor directory · Not right? Tell us
How we know: the Y Combinator directory · funding news · open dataset · 5k.vc investor directory · Not right? Tell us
How we know: Y Combinator's founder network · Not right? Tell us
How we know: Y Combinator's founder network · Not right? Tell us
Reported raises · per SEC filings
Form D private placements$800K disclosed across 2 rounds · 2017–2021
▶$500KraisedFeb 2022 · 10 investors · Other TechnologyRule 506(b)
- Andrei KlochkoExecutive Officer, Director
- Franck Gilles LahayeDirector
- Offering amount
- $500K
- Amount sold
- $500K
- Minimum investment
- $5K
- Proceeds to insiders
- $120K
- First sale
- Jun 2017
- Incorporated
- Corporation, Delaware, 2017
- Federal exemptions
- 06b
▶$300KraisedFeb 2022 · 3 investors · Other TechnologyRule 506(c)
- Franck Gilles LahayeDirector
- Andrei KlochkoExecutive Officer, Director
- Offering amount
- $300K
- Amount sold
- $300K
- Minimum investment
- $25K
- Proceeds to insiders
- $60K
- First sale
- Apr 2021
- Incorporated
- Corporation, Delaware, 2017
- Federal exemptions
- 06c
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
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Companies working in the same space as Airthium.
Legal entities · 1
corporate structureFrequently asked questions
- What does Airthium do?
- Airthium manufactures high-temperature industrial heat pumps that reach up to 550°C and operate in hybrid mode, switching between electricity and gas to optimize cost and carbon emissions. The system is designed for industrial process heat applications requiring reliable 24/7 operation in the 150–550°C range.
- Who founded Airthium?
- Airthium was founded by Andrei Klochko, Franck Lahaye in 2016.
- Who are Airthium's investors?
- Airthium's investors include Daphni, Polytechnique Ventures, Y Combinator, Agrolimen Ventures, DCVC (Data Collective).
- How much funding has Airthium raised?
- Airthium has disclosed $800K raised across 2 rounds.
- Where is Airthium headquartered?
- Airthium is headquartered in Paris, FR.








