Heirloom
Agent42Agent Readiness: 42/100. Above median. Measured by StartupHub.ai. Median 41.Trust81Data Trust: 81/100. Top 25%. Measured by StartupHub.ai. Median 61.Direct air capture startup using limestone to remove CO2 from the atmosphere at scale.
About
Heirloom is a direct air capture (DAC) company that removes CO2 from the atmosphere using crushed limestone, which naturally absorbs carbon dioxide. Unlike liquid-based DAC approaches, Heirloom's mineral-based process is lower-cost and faster to scale. The company operated America's first commercial DAC plant and raised $150M Series B in December 2024 co-led by Future Positive and Lowercarbon Capital.
Listed competitors
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Key facts
- Website
- heirloomcarbon.com
- Headquarters
- Brisbane, California, United States
- Founded
- 2020
- Employees
- 100
- Total funding
- $162M (Series B)
- Business model
- B2B
Tech stack
Detected on heirloomcarbon.com, last scanned 22 Oct 2026. Run your own scan
- CMS / Builders
- Webflow
- CDN
- Cloudflare
- Email provider
- Google Workspace
Heirloom scores 70. Does yours?
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Frequently asked
Is Heirloom trustworthy and reputable?
StartupHub's Data Trust & Reputation score for Heirloom is 81 out of 100, a trusted rating, based on site security posture, privacy practices, malware and phishing checks, and public reputation signals.
How much funding has Heirloom raised?
Heirloom has raised a total of $162M in funding. The most recent round on record is Series B.
How many employees does Heirloom have?
Heirloom has approximately 100 people on record.
Public record
SEC filings, insider activity, nonprofit links and pay benchmarks for Heirloom
