View details of this raise on Seedstage

Bee Cave, TX

Building containerized hybrid high-temperature heat pumps for industrial process heat, scaling to pilot-ready units with new IP and engineering hires.

• Pilot-ready containerized unit: The raise is intended to fund the build-out of the first pilot-ready containerized heat pump unit.
• Hybrid high-temperature heat: Airthium develops a containerized, plug-and-play hybrid system that connects to existing gas boilers for industrial heat production up to 250 C.
• Real-time switching: The system uses real-time monitoring and cost calculations every 15 minutes to coordinate electricity use when it is favorable and boiler operation when it is not.
• Scale toward paid pilots: The roadmap moves from a demonstrated 1 kW prototype to 10 kW testing and toward paid pilot installations planned for 2028.
• Heat-as-a-Service deployment: The company deploys through a Heat-as-a-Service model where a dedicated project entity finances, owns, and operates the equipment, and customers pay for delivered heat.

Airthium is raising capital to build the first pilot-ready containerized unit, expand its intellectual property, and hire key engineering and technical talent. The company targets industrial process heat in the 150 to 550 C range, where most facilities still rely on fossil-fueled boilers that can lock sites into a single energy source for decades. Airthium’s system converts electricity into high-temperature heat and connects to a factory’s existing gas boiler, allowing operators to choose the lower-cost option as market prices change. The containerized design is intended to install as a plug-and-play component outside the plant, with no factory-floor modifications and no interruption to production. Real-time software monitors energy conditions and recalculates the cost position every 15 minutes to coordinate hybrid operation, while fast cycling supports switching on short notice.

The hardware roadmap scales from a 1 kW prototype shown at 145 C to a 10 kW heat pump for testing and a pilot-ready configuration. Paid pilot installations with industrial partners are planned for 2028, with broader commercial deployments expected in 2029 after validation. Airthium targets energy savings of about 15 to 25 percent and a 4 to 7 year payback, depending on local gas and electricity pricing. Deployments follow a Heat-as-a-Service approach in which a dedicated project entity finances, owns, and operates the heat pump, and customers pay for delivered heat.

Company Info

Airthium develops containerized hybrid high-temperature heat pumps that convert electricity into industrial process heat while coordinating with existing gas boilers via a recurring heat supply model.

Airthium designs and builds containerized hybrid high-temperature heat pump systems for industrial process heat. The equipment targets temperatures up to about 250 C and is engineered for plug-and-play integration with facilities that already operate gas boiler infrastructure, without requiring major factory floor modifications.

The system can switch between electricity-driven heat production and gas boiler backup based on real-time operating conditions, supporting continuous 24 7 uptime when needed. It is intended for fast cycling to enable cost-aware dispatch, using on-site monitoring and periodic cost calculations to select the cheaper heat source. Deployment is structured around Heat as a Service, where customers pay for delivered heat consumption, creating recurring revenue tied to energy usage rather than one-time equipment sales.