What Heirloom does

Heirloom Carbon Technologies, Inc. is a U.S.-based Direct Air Capture (DAC) company founded in 2020 and headquartered in Brisbane, California, with Delaware incorporation. The company builds and operates DAC facilities that use a limestone (calcium carbonate)-based accelerated carbon mineralization process: limestone is heated in renewable-energy-powered kilns (integrated with Leilac's electric calcination technology) to release CO2 and produce calcium oxide/hydroxide ('lime'), which is then spread on vertically-stacked trays to absorb atmospheric CO2 in days rather than the years that natural weathering would require. The captured CO2 is permanently sequestered either in EPA Class VI underground injection wells or mineralized in concrete via CarbonCure Technologies. Each removal credit represents one metric ton of CO2 removed for 1,000+ years and is independently third-party monitored.

Heirloom's commercial model spans three channels: (i) a Shopify-powered e-commerce storefront selling credits to Individuals and Businesses, (ii) enterprise sales of multi-year, multi-hundred-thousand-ton bankable offtake agreements (Microsoft 315,000 t over 10+ years; United Airlines 500,000 t right-to-purchase; $26.6M Frontier buyers agreement for 26,900 t by 2030), and (iii) project-based consortium partnerships for federally funded Regional DAC Hubs and embedded CO2 supply for low-carbon fuel and concrete applications. Named customers span frontier-tech buyers (Stripe, Shopify, Meta, Klarna, Wise), financial services (JPMorgan), professional services (McKinsey, Workday, Autodesk), retail (H&M), and aviation (United Airlines, Japan Airlines).

The company operates one commercial facility in Tracy, California (1,000 t/yr, online since November 2023) and is building two facilities in Northwest Louisiana (combined ~320,000 t/yr by 2027-2028) under the DOE-funded Project Cypress hub. Heirloom is also participating in DAC Hub feasibility studies in Illinois, Florida, and eastern Washington, and signed MOUs in June 2026 with TKMS and thyssenkrupp Calvion for a large-scale Alberta, Canada hub. The company has raised over $200M in disclosed equity (Series A $53M, March 2022; Series B $150M, December 2024), with subsequent corporate investments from United Airlines, Development Bank of Japan, and Chiyoda Corporation, and employs 101-250 people. Co-founder and CEO Shashank Samala leads the company.

Name

Heirloom

Legal name

Heirloom Carbon Technologies, Inc.

Website

https://heirloomcarbon.com

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

1–10 employees

Short description

Heirloom is a U.S. Direct Air Capture company that uses limestone-based accelerated carbon mineralization to permanently remove CO2 from the atmosphere, serving enterprise customers (Microsoft, United Airlines, Frontier buyers) via multi-year offtake agreements and selling credits to individuals through an online storefront.

Ownership category

akta.pro rank

Product category

Carbon Removal Services

NAICS

Industrial Gas Manufacturing (32512), Waste Treatment and Disposal (5622)

SIC

Chemicals & Allied Products (2800), Misc Industrial & Commercial Machinery & Equipment (3590), Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564)

akta.pro primary industry

Direct Air Capture (DAC) Systems & Plants (EUABAFAA)

akta.pro secondary industries

Direct Air Capture (DAC) Project Development (EUABABAJ), Carbon Removal Credits Trading (DAC, BECCS, Biochar, Mineralization) (EUAGAIAL), Offsets & Carbon Removal Procurement (credits, DAC, nature-based removals) (THABANAE)

Keywords

• Direct air capture
• Carbon removal credits
• Carbon mineralization technology
• Permanent carbon sequestration
• DAC facilities

Headquarters

HQ city

Brisbane

HQ country

United States

HQ region

North America

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Technology or R&D, Operations, Infrastructure, Supply Chain, Personnel, Marketing or Sales

Revenue model

1. Carbon removal credit sales: Core revenue from selling permanent CO2 removal credits to Individual, Business, and Enterprise customers via direct purchase on Heirloom's website (Shopify storefront) and through negotiated enterprise contracts. DAC credits historically range from approximately €200 to €800 per ton depending on project and contract structure.
2. Multi-year offtake agreements: Long-term, multi-year offtake contracts with large corporate buyers such as Microsoft (315,000 metric tons over 10+ years) and Frontier buyers ($26.6M, 26,900 tons by 2030), which generate predictable, durable cash flows used to support project financing.
3. CO2 offtake for low-carbon fuel production: Right-to-purchase agreements for DAC-derived CO2 to be used as feedstock for sustainable aviation fuel (SAF), e-kerosene, e-methanol, and e-diesel. Example: United Airlines Sustainable Flight Fund has the right to purchase up to 500,000 tons of CDR for SAF production or permanent storage.
4. Government-funded project revenue (DAC Hubs): Revenue tied to DOE Office of Clean Energy Demonstrations funding for regional DAC Hubs (Project Cypress awarded initial $50M, eligible for up to $600M in matched federal investment), with $51M in mobilized private co-investment for the first phase.

Pricing tiers

Go-to-market motion5 records

Distribution channels4 records

Marketing channels7 records

Core offering

Heirloom operates Direct Air Capture (DAC) facilities that capture atmospheric CO2 using limestone-based accelerated carbon mineralization powered by renewable energy. The captured CO2 is then stored permanently either via underground Class VI well sequestration or mineralized into concrete, and the company sells the resulting permanent carbon dioxide removal (CDR) credits to individuals, businesses, and enterprise buyers through multi-year offtake agreements.

Differentiator

Problem solved

Functional benefit

Products and services

• Permanent Carbon Removal Credits Verified, permanent carbon dioxide removal credits produced from Heirloom's Direct Air Capture facilities using limestone-based accelerated carbon mineralization, with storage via underground Class VI injection wells or mineralized concrete. Sold to individual, business, and enterprise customers.
• CO2 Supply for Concrete Mineralization Captured atmospheric CO2 supplied to concrete producer CarbonCure Technologies for mineralization inside ready-mix concrete, delivering a lower-embodied-carbon concrete product for the construction industry.
• CO2 Supply for Low-Carbon Fuel Production (SAF/e-fuels) DAC-sourced CO2 supplied as feedstock for sustainable aviation fuel (SAF) and synthetic low-carbon fuel production via partners such as LanzaTech, targeting hard-to-abate aviation and shipping emissions.

Quantifiable outcome

• Reduced DAC removal costs by over 50% since May 2021
• +8 more outcomes

Named customers14 records

Segments6 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

AI capability1 record

Feature8 records

Partnerships

14 partnerships are on record, tiered flagship, core and minor.

• TKMSflagshipStrategic or Co-development Partner · 11 June 2026Signed two MOUs on June 11, 2026 with Heirloom Carbon Technologies and thyssenkrupp Calvion to develop a large-scale Direct Air Capture hub in Alberta, Canada. TKMS commits substantial investment to build a Canadian DAC hub aligned with Canada's Industrial and Technological Benefits policy, targeting commercialization of DAC.
• thyssenkrupp CalvionflagshipTechnology or Integration · 11 June 2026Engineering and systems integration partner in the Alberta DAC Hub consortium with TKMS and Heirloom. Combines Heirloom's accelerated mineral carbonation expertise with thyssenkrupp Calvion's engineering and scale-up expertise. MOUs signed June 11, 2026 for research, technology transfer, and DAC commercialization.
• Chiyoda CorporationflagshipStrategic or Co-development Partner · 2 December 2025Invested in Heirloom in December 2025 and brings extensive experience in CO2 recovery, capture, and utilization systems. Supports deployment of DAC systems that integrate seamlessly with industrial and energy infrastructure, particularly in Japan.
• United Airlines Ventures Sustainable Flight FundflagshipStrategic or Co-development Partner · 24 February 2025Entered into an agreement (Feb 24, 2025) for the right to purchase up to 500,000 tons of CDR for SAF production or permanent underground storage, plus an equity investment in Heirloom as part of the $150M Series B. First DAC technology investment by the Fund.
• University of Illinois at Urbana-Champaign (Illinois Basin and Florida Regional DAC Hubs)coreImplementation/ SI/ Consulting Partner · 6 August 2024Heirloom is working with UIUC and project partners to explore feasibility of DAC Hubs in Illinois (DE-FE0032375, $2.9M federal + $970K private) and Florida (DE-FE0032378, $2.8M federal + $930K private). The Illinois hub targets 200,000 t/yr (1M+ at full scale); the Florida hub targets 150,000 t/yr (1M+ potential).
• Battelle (Project Cypress consortium lead)flagshipStrategic or Co-development Partner · 26 March 2024Project Cypress is a partnership led by Battelle with Heirloom and Climeworks, awarded a $50M contract (and eligible for up to $600M in matched federal investment) from DOE's Office of Clean Energy Demonstrations to establish one of the nation's first Regional DAC Hubs in Louisiana, targeting 1 million tons/year of CO2 removal by 2030. Heirloom's portion will be located in Caddo-Bossier Parish, removing up to ~320,000 t/yr across two facilities.
• CarbonCure TechnologiesflagshipStrategic or Co-development Partner · 31 October 2023Agreement signed October 31, 2023, extending through 2025, to permanently store atmospheric CO2 captured by Heirloom's DAC facilities in concrete using CarbonCure's carbon mineralization technologies. Pioneered the world's first-ever DAC-to-concrete storage demonstration in 2023. CarbonCure licenses mineralization tech to nearly 800 concrete plants in 35 countries.
• Leilac (Calix)flagshipTechnology or Integration · 30 October 2023Licence and collaboration agreement signed October 30, 2023, following an MOU in February 2023, to deploy renewably-powered electric kilns at Heirloom's future DAC facilities. Leilac's electric calcination technology will be used to heat limestone, producing high-purity CO2 for permanent storage and calcium oxide that loops through Heirloom's process. Aims to leverage Leilac's existing pilot and demonstration infrastructure (e.g., 100,000 t/yr demonstration plant in design) for DAC scale-up.
• Climeworks (Project Cypress partner)flagshipStrategic or Co-development Partner · 11 August 2023Co-partner with Heirloom under the Battelle-led Project Cypress DAC Hub consortium in Louisiana. Both were selected by the DOE for up to $600M in funding. Climeworks' portion is being built in Calcasieu Parish.
• Carbon Removal AlliancecoreOthers · 22 February 2023Heirloom joined as a founding Board member of the Carbon Removal Alliance, a first-of-its-kind coalition of carbon removal technology companies and buyers advocating for permanent carbon removal. Members commit to permanence (1,000+ years), net negativity, additionality, and verifiability.
• CapturePointcoreStrategic or Co-development PartnerCarbon management partner that will store the CO2 captured from Heirloom's Louisiana facilities in Class VI underground wells. Pipeline and storage wells used for Heirloom's captured CO2 will be dedicated to permanent CO2 storage.
• Gulf Coast SequestrationcoreStrategic or Co-development PartnerLocal carbon storage company partnering with the Project Cypress consortium (Battelle, Climeworks, Heirloom) to sequester captured CO2 in Class VI wells. Was in the advanced stages of obtaining Class VI well approval from the U.S. EPA at the time of DAC Hub selection.
• RMI (Ankeron DAC Hub)minorStrategic or Co-development PartnerHeirloom joined the Ankeron DAC Hub convened by clean energy nonprofit RMI, carbon mineralization company Carbfix, and Pacific Northwest National Lab (PNNL), to study feasibility of carbon mineralization and carbon management in eastern Washington and neighboring states. Eligible for up to $3M from DOE.
• Ava Community EnergycoreOthersLocal renewable energy supplier that provides 100% additional renewable energy to Heirloom's Tracy, California DAC facility. Also a partner in the Tracy Community Governance Model with PG&E Corporation and the State Building Trade Union affiliates.

Scale indicators11 records

Recent moves8 records

Expansion highlights7 records

Direct peers

• Climeworks: Swiss-based DAC pioneer using amine-based solid sorbents in containerized 'Orca' and 'Mammoth' plants. Most directly comparable to Heirloom as the two leading commercial DAC operators globally and co-partners in Project Cypress, competing head-to-head for voluntary offtake and DOE Hub funding.
• 1PointFive (Occidental subsidiary): Occidental's DAC subsidiary built on the acquired Carbon Engineering liquid-solvent KOH-based process; commissioning Stratos, the largest planned DAC plant to date (~500,000 t/yr). Direct competitor in solid-vs-liquid DAC pathways, competing for 45Q credits and corporate offtake.
• CarbonCapture Inc. U.S.-based DAC developer commercializing a solid-sorbent process for gigaton-scale deployment. Direct competitor to Heirloom in solid-sorbent DAC technology, pursuing similar enterprise and government offtake.
• Global Thermostat: Earlier-stage U.S. DAC company using amine-based solid sorbents on structured contactors. Direct competitor in the same DAC technology category with several pilot/demo facilities operating, competing for corporate offtake and federal funding.

Emerging players

• Verdox: MIT-spinout DAC startup using electro-swing adsorption to capture CO2 with renewable electricity. Comparable to Heirloom's renewable-electricity-powered calcination pathway, competing for premium low-carbon DAC credit buyers.
• Avnos: U.S.-based hybrid DAC company combining CO2 capture with water generation. Emerging competitor with a different technical approach but overlapping customer base in voluntary CDR markets and DOE funding programs.
• CarbonOrO: Canadian DAC startup pursuing mineral carbonation pathways. Closest comparable on technology approach (mineralization, similar to Heirloom's limestone process) and increasingly relevant as Canada builds out CCUS policy frameworks.
• Capterio: CCUS infrastructure developer focused on storage hub development, including partnerships with DAC providers. Comparable because storage access is Heirloom's key bottleneck; Capterio represents both a potential partner and a competing storage infrastructure play.

Broad incumbents

• Battelle: Large U.S. applied science nonprofit leading the Project Cypress DAC Hub consortium with Heirloom and Climeworks. Comparable as a federal funding conduit and R&D partner, and a broad incumbent in environmental and energy RD&D relevant to DAC deployment.

Others

• CarbonCure Technologies: Carbon mineralization technology provider licensed to ~800 concrete plants in 35 countries. Direct technology and storage partner with Heirloom for DAC-to-concrete storage; adjacent rather than directly competitive, but a key enabler in Heirloom's storage stack.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/heirloomcarbon
• LinkedInlinkedin.com/company/heirloom-carbon

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Funding overview

Funding rounds7 records

Investors31 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Heirloom