Pascal, a startup developing high-efficiency climate-friendly heat pumps, air conditioners and refrigerators based on solid refrigerants, introduced its novel technology and announced it has raised an $8 million seed round led by Engine Ventures, with Khosla Ventures and previous investor Blindspot Ventures participating. The funding will be used to productize Pascal's low pressure, solid refrigerant-based system, conforming to commercial HVAC specifications. The company will also use the capital to expand its Boston-based team of mechanical engineers, chemists, and material scientists.