Ethylene and propylene glycol solutions are intended for use in closed primary and secondary heating, cooling and refrigeration systems. The fluids are fully inhibited glycol-based solutions designed for applications where no incidental contact with humans, food or beverage products could occur. The heat transfer fluids are manufactured using only new, virgin glycol. The inhibitor package is scientifically formulated of food-grade ingredients and blended into the glycol under tightly controlled manufacturing procedures.