Have you never heard of R717 refrigerants?
R-717 is a refrigerant grade ammonia (N H 3 ) that's used in industrial refrigeration and air conditioning systems. What constitutes Ammonia? Ammonia, NH 3 , is a comparatively stable, colourless gas at ordinary temperatures, with a boiling point of -33℃ . Ammonia gas is lighter than air, with a density of approximately 0.6 times that of air at the same temperature. The characteristic pungent odors of ammonia can be detected as low as 15ppm. Ammonia can be highly toxic to a wide range of organisms. In humans, the greatest risk is from inhalation of ammonia vapour, with effects including irritation and corrosive damage to skin, eyes and respiratory tracts. At very high levels, inhalation of ammonia vapour can be fatal. When dissolved in water, elevated levels of ammonia are also toxic to a wide range of aquatic organisms. Ammonia is highly soluble in water, although solubility decreases rapidly with increased temperature. Ammonia reacts with water in reversible reaction ...