Comprehensive Glossary of Heating & Air Conditioning Terms.
| Term | Definition |
|---|---|
| Refrigerant | A chemical that produces a refrigerating effect while expanding and vaporizing. Most residential air conditioning systems contain R-22 or R-410A refrigerant. New HVAC systems will use the R-410A refrigerant as R-22 is scheduled to stop production by the year 2020. |




