Aira

Energy · Stockholm, SE

Clean energy technology company designing and installing air-source heat pumps to replace residential gas boilers.

Founders

Harald Mix (Sweden · ♂) — A Swedish private-equity veteran and climate-tech company-builder behind Northvolt and H2 Green Steel, Mix launched Aira through his Vargas holding company to attack home heating decarbonization with consumer heat pumps.
Carl-Erik Lagercrantz (Sweden · ♂) — As co-founder and CEO of the Vargas company-building firm behind Northvolt, Lagercrantz applied the same reverse-VC playbook to create Aira and electrify European home heating.

Shares the most investors with (number = shared investors):

Date	Round	Amount
Aug 2025	Growth Aira raised €150 million in equity from existing investors including Altor, Kinnevik, Lingotto and Temasek to grow in the European residential heating market.	$174M
Oct 2024	Series B Aira secured a €63M Series B extension from existing investors including Temasek, Statkraft Ventures, Kinnevik and Altor to expand its heat pump business in Germany, Italy and the UK.	$66.2M
Jun 2024	Debt Aira, a Stockholm heat-pump clean-energy firm, secured EUR200M in debt commitments from BNP Paribas for consumer financing.	$216M
Jan 2024	Series B Stockholm clean-energy company Aira raised a EUR 145M Series B from Altor, Kinnevik and Temasek to electrify residential heating in Europe.	$156.6M
Oct 2023	Funding round Swedish clean-energy company Aira raised SEK1B (about EUR86M) from Altor, Kinnevik, Creades and others to scale heat-pump-based home heating across Europe.	$86M

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