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Heirloom Carbon

Energy · San Francisco, United States · Founded 2020

Removing 1B tons of CO2 from the air by 2035 by engineering the most cost-effective, scalable direct air capture system MoreLess

Heirloom Carbon is a pioneering startup in the environmental technology sector, focusing on the reduction of atmospheric carbon dioxide (CO2) levels. The company's primary service is the development and deployment of Direct Air Capture technology, a process that extracts CO2 directly from the atmosphere. This technology leverages the natural carbon-absorbing properties of limestone, one of the most abundant rocks on the planet, to accelerate the process of carbon mineralization, transforming CO2 into rock in a matter of days.

Heirloom Carbon's business model revolves around the sale of carbon removal credits, a market-based tool that allows companies to offset their carbon emissions. These credits represent the permanent removal and safe storage of CO2, either underground or within building materials like concrete. The company's first commercial facility, established in 2020, serves as a testament to their rapid technological and business progress.

The startup operates in the growing carbon credit market, catering to environmentally conscious businesses seeking to reduce their carbon footprint. By offering carbon removal credits at a cost of less than $100 per ton of CO2 by 2035, Heirloom Carbon positions itself as an affordable solution for companies aiming to achieve carbon neutrality.

In addition to its environmental impact, Heirloom Carbon also contributes to the green economy by creating high-paying jobs in the environmental technology sector. The company's operations align with principles for responsible carbon removal, ensuring minimal environmental footprint.

Keywords: Carbon Capture, Carbon Credits, Environmental Technology, Limestone, Carbon Mineralization, Carbon Neutrality, Green Jobs, Carbon Removal, Direct Air Capture Technology, Carbon Offset.

Company overview

Heirloom Carbon company information

The essential company record, classifications and operating signals in one place.

Status
Operational
Founded
2020
Headquarters
San Francisco, United States
Employees
167
Open positions
1
Dealroom signal
64.0
business modelManufacturingsectorSustainable Development GoalssectorCarbon Capture and StoragesectorClimate TechsectorDirect Air CapturesectorCarbon RemovalsectorHard TechsectorDT and LSsectorscience-basedindustryEnergyclient focusb2btechnologyHardwaretechnologyDeep Tech

Valuation & funding

Heirloom Carbon funding history

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES BOther financing Dec 2024 $150M $600M H&M · Mitsubishi · Breakthrough Energy Ventures · Ahren Innovation Capital
SERIES AOther financing Mar 2022 $53M $212M Breakthrough Energy Ventures · Microsoft Climate Innovation Fund · Carbon Direct · Bill Gates
SEEDOther financing May 2021 $1M $4M Lowercarbon Capital · Prelude Ventures · Breakthrough Energy Ventures · MCJ Collective
GRANTOther financing Jan 2021 US National Science Foundation
Showing 4 recorded eventsUnlock the complete deal history →

Growth signals

Heirloom Carbon website traffic

Latest recorded traffic for Heirloom Carbon is 3.5K monthly website visits, down 61.5% over the last three months. Heirloom Carbon's team declined 7.2% over the past year.

Latest monthly visits3.5K 3-month web change-61.5% 1-year team growth-7.2%
Monthly website visits71 observations · Apr 2020–Jul 2026
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Hiring

Open positions at Heirloom Carbon

Current openings linked to this company in Dealroom.

2 distinct openings shownExplore hiring signals →

Comparisons

Heirloom Carbon compared with similar companies

Dealroom’s weighted taxonomy model identifies the closest operating peers. Company identity and context stay open; selected comparison metrics preview what is available in the platform.

Showing 8 of the closest matchesCompare every metric →

Talent graph

Heirloom Carbon's talent

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Team profiled 15 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 2 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Investors

19 investors on Heirloom Carbon's cap table

Sourced from Dealroom's funding and investor records.

Seed 5 investors entered at this stage
US National Science Foundation
Lowercarbon Capital
Prelude Ventures
Breakthrough Energy Ventures
MCJ Collective
Series A 14 investors entered at this stage
Carbon Direct
Ahren Innovation Capital
Microsoft Climate Innovation Fund
Bill Gates
Future Positive Capital
H&M
Mitsubishi
Carbon Direct Capital Management
Quantum Innovation Fund
Mitsui
Siemens Financial Services
Japan Airlines (JAL)
United Airlines Venture
MOL Switch

Global footprint

Where Heirloom Carbon has talent and traffic

Workforce by country
2 countries with
team presence
🇺🇸 United States99.1%
🇨🇦 Canada0.9%
2 countries shown

In the news

Latest news about Heirloom Carbon

Recent press, funding announcements, and product moves mentioning Heirloom Carbon — open to read from the original sources.

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Market sentiment

What the market is saying about Heirloom Carbon

An AI-synthesized read of the highest-engagement posts about Heirloom Carbon on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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