Yet, even though the methods have changed over the years, the basic principles of cooling have been the same for centuries and we have always used a cooling substance and some form of insulation.Refrigerants work by moving through the refrigeration cycle changing from gas to liquid and back again.Early refrigerants posed risks but the R-134a and R-600a refrigerants used today are non-corrosive, non-toxic, low cost, and environmentally friendly.
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