InstaBidsWhat is a refrigerant?
A refrigerant is a fluid that circulates through a refrigeration system to move heat. It absorbs heat as it boils into vapor and releases heat as it condenses back into liquid.
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Where are refrigerants used?
Refrigerants carry heat in household air conditioning and food refrigeration, and their applications extend beyond the home. NIST also identifies refrigerated transport for food and vaccines as part of this wider use. “But refrigeration also encompasses air conditioning (in everything from cars to commercial buildings), the transport of food and vaccines across vast distances and much more.” Source: National Institute of Standards and Technology, read 2026-10-31.
What is a refrigerant in a refrigeration system?
A refrigerant is the circulating fluid that moves heat out of a cooled space. In the cycle NIST describes, it absorbs heat while boiling into vapor, then releases that heat as it condenses into liquid. “A refrigeration system moves heat from a space to be cooled to the outside environment by circulating a fluid called a refrigerant.” Source: National Institute of Standards and Technology, read 2026-10-31. “First, the fluid boils into a vapor and absorbs heat.” Source: National Institute of Standards and Technology, read 2026-10-31. “Then, it condenses back into a liquid to send the heat outside.” Source: National Institute of Standards and Technology, read 2026-10-31.
What is an ‘R’ number?
The R designation identifies a refrigerant under the numbering system described in ASHRAE Standard 34. The leaflet gives the designation format as R-XXX; the number belongs to the fluid identification system. “Refrigerants are numbered with and assigned an R-XXX number in accordance to ASHRAE Standards-34.” Source: ASHRAE and UN Environment OzonAction, read 2026-10-31.
How can I find out what kind of refrigerant my home air conditioner contains?
The unit’s nameplate usually identifies its refrigerant. For a central air conditioner, EPA places that nameplate on the outdoor condenser, making the equipment label a starting point for understanding which fluid it contains. “The refrigerant used in your home air conditioner is typically listed on the unit’s nameplate.” Source: U.S. Environmental Protection Agency, read 2026-10-31. “For central air conditioners, the nameplate is usually on the outdoor condenser.” Source: U.S. Environmental Protection Agency, read 2026-10-31.
Are refrigerants available for home air conditioners that do not harm the ozone layer?
EPA says ozone-friendly refrigerants are available for home air conditioners. Its answer also distinguishes ozone effects from climate effects: most HFCs remain potent greenhouse gases, so avoiding ozone damage does not remove every environmental concern. “Yes, a number of ozone-friendly refrigerants are available and widely used today.” Source: U.S. Environmental Protection Agency, read 2026-10-31. “Like the ozone depleting refrigerants being replaced, most HFCs are potent greenhouse gases and also must be handled consistent with EPA’s Refrigerant Management Program requirements.” Source: U.S. Environmental Protection Agency, read 2026-10-31.
Sources
- Refrigerants for Life — ASHRAE and UN Environment OzonAction; published 2019-06-26; read 2026-10-31.
- Homeowners and Consumers: Frequently Asked Questions — U.S. Environmental Protection Agency; read 2026-10-31.
- Spotlight: Overhauling the Refrigeration Industry to Fight Global Warming — National Institute of Standards and Technology; published 2022-06-26; read 2026-10-31.