Kelvin

Kelvin helps decarbonize older buildings by combining retrofit-friendly hardware with cloud-based automation. Its flagship product, the Cozy, is a thermostatic cover that transforms steam radiators into zone-controlled systems, reducing overheating and energy waste in buildings that typically lack central HVAC. The company has since expanded into hybrid electrification, integrating heat pumps and thermal batteries to shift buildings toward electric heating and cooling with minimal infrastructure upgrades. All systems are tied into Kelvin’s software layer, which offers remote monitoring, analytics, and building-wide control.

Kelvin operates under a flexible hybrid sales model. Property owners can either purchase Cozy covers outright (around $750 each, plus install fees) or enroll in a no-upfront subscription model, paying a monthly per-unit fee (typically $10–15) that covers hardware, installation, and software services. Larger hybrid electrification projects are often financed through energy-as-a-service contracts. Kelvin also works with partners like ClearGen, which has pledged up to $100M to help fund these deployments. This model enables deep energy savings and emissions reductions without requiring building owners to front the capital.