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Recently came out of stealth: https://techcrunch.com/2024/02/15/arch-heat-pump-seed-round/

What: We are accelerating adoption of sustainable heating systems in the US
Impact: Residential homes are responsible for 18% (1Gt) of all CO2!
Investors: Raised $6.2M seed, 2 year runway, prominent climate VCs - Coatue, Gigasclae Floodgate, MCJ, ReGen and the founders of Aurora Solar
Founders: Phil Krinner (Solar exec, McKinsey, Stanford) and Sacha Schmitz (Software Engineer & Designer, ex-YC, third time founder)
Team: We are a powerful team of seven and growing! (4 Engineers, 1 Product & Design, 2 Business). FWIW, our combined team started 7 companies with some quite successful exits before.