Heirloom Carbon
Direct air capture using limestone as a sponge — passive, cheap, and scalable. Building megaton-scale removal capacity.
- Location
- San Francisco, United States
- Raised
- $120M+
- Stage
- Series A
- Founded
- 2020
- Category
- Other
- Funding
- VC-backed
- Team
- 51-200
Funding figures as of Jul 2025 · not independently verified
Founders of Heirloom Carbon
- Shashank Samala
- Noah McQueen
Investors backing Heirloom Carbon
- Lowercarbon Capital
- Carbon Direct
- Microsoft
Frequently asked questions
What does Heirloom Carbon do?
Direct air capture using limestone as a sponge — passive, cheap, and scalable. Building megaton-scale removal capacity.
Where is Heirloom Carbon based?
Heirloom Carbon is based in San Francisco, United States.
When was Heirloom Carbon founded?
Heirloom Carbon was founded in 2020.
How much has Heirloom Carbon raised?
Heirloom Carbon has raised $120M+ in their Series A round as of Jul 2025.
Who founded Heirloom Carbon?
Heirloom Carbon was founded by Shashank Samala, Noah McQueen.
Who has invested in Heirloom Carbon?
Heirloom Carbon is backed by Lowercarbon Capital, Carbon Direct, Microsoft.
How Heirloom Carbon would pitch themselves
○ Auto-generated01Target customer
Customers in the Heirloom Carbon space — typically operators or teams running into the problem this product solves.
02Problem they solve
Direct air capture using limestone as a sponge — passive, cheap, and scalable. Building megaton-scale removal capacity. The category has historically been served by tools that miss the modern workflow this product is built around.
03Key differentiator
Heirloom Carbon differentiates on the cheapest, fastest way to remove carbon at scale. Backed by Lowercarbon Capital + Carbon Direct, $120M+ raised — the company has resources + validation to compound this thesis. Founded by Shashank Samala + team.
04Go-to-market strategy
Series-A scaling stage — building outbound sales motion, hiring first AEs, layering on customer success. Mix of PLG (where the product allows) + direct sales for higher-ACV deals.