Pascal's Solid-State Heat Pump Technology Promises 20% Efficiency Gains Over Traditional Models

Serendipitous Discovery Leads to Heat Pump Innovation

A breakthrough in refrigeration technology emerged from unexpected experimental results at Harvard University. Adam Slavney and Jinyoung Seo discovered a new class of materials that could fundamentally improve how refrigerators, air conditioners, and heat pumps operate. After three months of investigation followed by a year or more of rigorous testing, the pair had definitive proof of their discovery. This finding now anchors Pascal, their startup, which Slavney leads as CEO while Seo serves as Chief Technology Officer. The company recently closed an $8.5 million follow-on funding round, co-led by Sazze Partners and LB Investment with additional participation from KDB Silicon Valley.

A 170-Year Problem Finally Addressed

Heat pump technology dates back roughly 170 years, yet the cooling appliance industry has pursued the same fundamental optimization for decades: finding better refrigerants. For the past 35 to 40 years, researchers have engaged in what Slavney describes as a never-ending game of whack-a-mole. Older refrigerants like Freon destroyed the ozone layer, while newer compounds such as R-134a remain potent greenhouse gases. The core challenge: developing refrigerants that are environmentally safe, don't harm the atmosphere, and maintain performance equivalent to existing solutions. Pascal's approach sidesteps this dilemma entirely by transitioning from gaseous refrigerants to solid-state alternatives.

How Solid-State Refrigeration Works

Pascal's system operates on a fundamentally different principle than traditional refrigerants. Rather than rely on compressing a solid block of material, the startup compresses carbon dioxide gas into a cartridge containing a proprietary sponge-like material. As CO2 enters the porous material, gas molecules collide with the material's internal walls, transferring energy and warming it. A heat exchanger then releases this heat. When reversed, the process absorbs energy from the heat exchanger and transfers it to the CO2 molecules. In a Pascal refrigerator, two cartridges operate simultaneously—one absorbing heat from inside the unit while transferring it to carbon dioxide, and the other moving that heat from the CO2 to outside air. Once the cartridges reach extreme temperatures, the flow reverses. Testing has proven the material robust, withstanding 300,000 cycles equivalent to approximately one year of continuous operation.

Efficiency Gains and Commercial Path Forward

Pascal's technology delivers approximately 20% greater efficiency compared to existing refrigeration models. Critically, the system accomplishes this without requiring the high-pressure operation that constrains other solid-state refrigerant approaches. Slavney emphasizes that because Pascal uses conventional compression systems, manufacturing can be scaled cost-effectively, enabling widespread adoption. The company has already signed a pilot contract with a multinational beverage company, demonstrating commercial viability ahead of schedule. This early customer contract accelerated the funding process. Pascal plans to deliver its first prototype in early 2026, followed by a batch of more refined refrigerators targeted for 2028. Since solid-state materials cannot escape to the atmosphere, the technology eliminates both climate and ozone concerns that plague modern refrigerants, addressing a 35-year cycle of environmental trade-offs in the cooling industry.