ComStar International Inc. develops premium Glycol for Geothermal System applications that provide reliable freeze protection and corrosion resistance. Engineered to maintain excellent heat transfer efficiency, this high-performance glycol helps geothermal systems operate effectively in all climates. HVAC professionals appreciate ComStar's commitment to quality, consistency, and environmentally responsible manufacturing. With over 50 years of experience producing industrial-strength chemical products, ComStar continues to support geothermal installations with dependable solutions that improve efficiency, protect equipment, and extend system lifespan.