Who founded Airthium?

Airthium was founded by Andrei Klochko, Franck Lahaye, Franck Gilles Lahaye in 2016.

Who are Airthium's investors?

Airthium's investors include Daphni, Polytechnique Ventures, Y Combinator.

How much funding has Airthium raised?

Airthium has disclosed $800K raised across 2 rounds.

Where is Airthium headquartered?

Airthium is headquartered in Paris, FR.

Airthium

YC S17

Paris, FR · Founded 2016 · 18 employees · 3 known investors

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.

Advanced Manufacturing Cleantech Climate Tech Hardware Energy Storage Hard Tech Climate EnergyFranceEuropePartly Remote

Founders & leadership· Y Combinator alumni (S17)

Airthium was founded in 2016 by Andrei Klochko, Franck Lahaye, and Franck Gilles Lahaye.

Andrei Klochko inCEO and co-FounderAndrei Klochko holds a PhD in Plasma Physics from École Polytechnique and founded Airthium in 2015, where he serves as CEO and CTO.

Franck Lahaye inCo-FounderCo-founder of Airthium, which manufactures high-temperature industrial heat pumps for process heating applications.

Franck Gilles LahayeCo-founder

Investors · 3

DaphniParis · $540K – $6.5M

Polytechnique VenturesParis

Y CombinatorSan Francisco · $500K

Reported raises · per SEC filings

Form D private placements

$800K disclosed across 2 rounds · 2017–2021

▶$500KraisedFeb 2022 · 10 investors · Other Technology

Rule 506(b)

Officers, directors & promoters on the filing

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

Full filing on SEC EDGAR ↗

▶$300KraisedFeb 2022 · 3 investors · Other Technology

Rule 506(c)

Officers, directors & promoters on the filing

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

Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

In the news

The Rise of Climate Project Crowdfunding (Climatize, Raise Green/Honeycomb Credit & Beyond)superpowers4good.com · Nov 2025

Daphni launches €250m climate tech fund to back ‘scientist-entrepreneurs’ | Siftedsifted.eu · Mar 2025

Y-Combinator Backed Airthium's Breakthrough Engine Aims to Replace Fossil Fuels and Decarbonize Industrial Heat and Power Generationfinance.yahoo.com · May 2023

Airthium on Wefunder 2022 - Kingscrowdkingscrowd.com · Sep 2022

2021 Airthium (YC S17) Report | Wefunderwefunder.com

Frequently 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, Franck Gilles Lahaye in 2016.
Who are Airthium's investors?: Airthium's investors include Daphni, Polytechnique Ventures, Y Combinator.
How much funding has Airthium raised?: Airthium has disclosed $800K raised across 2 rounds.
Where is Airthium headquartered?: Airthium is headquartered in Paris, FR.