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2. Chlorodifluoromethane - Wikipedia

   en.wikipedia.org/wiki/Chlorodifluoromethane

   The refrigeration and air conditioning industry had already discontinued production of new R-22 equipment. The practical effect of these rulings is to reduce the cost of imported R-22 to maintain aging equipment, extending its service life, while preventing the use of R-22 in new equipment.

3. Freon - Wikipedia

   en.wikipedia.org/wiki/Freon

   In the late 1920s, a research team was formed by Charles Franklin Kettering in General Motors to find a replacement for the dangerous refrigerants then in use, such as ammonia. [3] The team was headed by Thomas Midgley Jr. [ 4 ] In 1928, they improved the synthesis of CFCs and demonstrated their usefulness for such a purpose and their stability ...

4. List of refrigerants - Wikipedia

   en.wikipedia.org/wiki/List_of_refrigerants

   The table is sortable by each of the following refrigerant properties (scroll right or reduce magnification to view more properties): Type/prefix (see legends); ASHRAE number

5. Invoice price - Wikipedia

   en.wikipedia.org/wiki/Invoice_price

   However, in many industries, the "invoice cost" actually varies from the "net purchase cost," or the actual price of a product. The invoice cost of a product is the price that the merchant pays for the product before marking it up to sell. The invoice cost is sometimes used in industries such as automobile sales to entice customers to buy.

6. Refrigerant - Wikipedia

   en.wikipedia.org/wiki/Refrigerant

   A DuPont R-134a refrigerant. A refrigerant is a working fluid used in cooling, heating or reverse cooling and heating of air conditioning systems and heat pumps where they undergo a repeated phase transition from a liquid to a gas and back again.

7. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Air conditioning can be achieved using a mechanical 'air conditioner' or by other methods, including passive cooling and ventilative cooling. [2] [3] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC). [4]