Cost-effective, scalable direct air capture system


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Company mission

To work towards a more resilient, equitable, and prosperous world for everyone.



HQ Location

Dogpatch, San Francisco, CA


66% employee growth in 12 months

Otta's take on Heirloom

Xav Kearney headshot

Xav Kearney

CTO of Otta

We are living in a climate emergency. According to the UN, any pathway that avoids disastrous climate consequences of a world 1.5 degrees warmer requires not only reducing carbon emissions, but also actively removing billions of tons of atmospheric carbon dioxide.

Heirloom is working on one such technology that may enable us to meet this gargantuan task, carbon mineralisation. Heirloom uses the world’s second most abundant material, limestone to capture CO2 directly from the atmosphere, and then permanently and safely stores that CO2 so that it doesn't return back to the air.

Crucially, because its primary feedstock is a widely available mineral that uses a chemical reaction to capture carbon, the result is in principle a relatively low-capex, low-opex process that can verifiably extract carbon from the atmosphere while minimizing the land and energy required.

The biggest challenge for Heirloom will be developing its technology to prove that it can be more efficient and work at lower cost. Until then, it will not be able to compete on price with nature-based offset projects.

Total funding - $54m

Last 2 fundraises

May 2021



Mar 2022



This company has top investors

Company benefits

  • Covered health, dental and vision. Health, dental and vision insurance covered by Heirloom
  • Generous parental leave. 16 weeks paid leave for all Heirloom employees, regardless of primary/secondary caregiver status
  • Generous stock options
  • Flexible time off. Unlimited PTO for exempt (salaried) employees & 80 hours for full time non-exempt (hourly) employees
  • Stay healthy. Monthly health and wellness reimbursement
  • Learn on the job. Robust annual education and conference budget, including airfare and hotel costs

Company values

  • Radical Honesty | Bottom line - we are open, transparent, and inclusive in everything we do. We aren't scared to challenge each other, but bring clear motives and our best intentions when we do
  • Persistent Optimism | We carry an infinite amount of optimistic energy with us on our journey, constantly chipping away at what may seem insurmountable
  • Maximize Learning Rate | Compounding knowledge is our key to victory - we continuously hone our crafts, seek the fastest paths to new learning, and are quick to absorb new knowledge


Previously founded Tempo Automation, a robotics and software company that raised millions in funding from venture capitalists.

Noah McQueen

(Head of Research)

PhD candidate in Chemical Engineering at the University of Pennsylvania. Worked as a Science Advisor at Carbon Direct for a year.

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Heirloom is hiring for 2 jobs on Otta!

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