Heat Inverse, founded by manufacturing and prototyping entrepreneur Romy Fain, develops CoolFilm, an ultra-thin passive cooling film for outdoor equipment. Based in Ithaca, the company uses thermodynamics and photonics to create a durable material that rejects solar heat and emits internal heat without electricity or moving parts. Its pilots have included battery storage, solar inverters, refrigerated trucks and power-generation equipment, with reported cooling gains including a 25–50% reduction in battery HVAC duty cycles.