Measurement terms
Superheat, subcooling, and saturation are measurement terms used with refrigerant readings and PT charts. Glide is the term people often ask about first, and it appears on some blends and chart references. For a quick temperature-based reference, see the PT chart and the superheat and subcooling calculator.
What is glide?
Glide is a glossary term tied to refrigerant behavior during phase change. In practice, it helps explain why some readings are compared against both bubble and dew point values rather than one single saturation point.
Safety and class
A1 and A2L are refrigerant safety class terms, and GWP stands for global warming potential. If you are building a record set or learning the labels that appear in refrigerant notes, start with the EPA 608 recordkeeping guide and the home page.
What is A2L?
A2L is a safety class label used for some refrigerants. It is one of the short codes technicians may see on equipment data and handling references, alongside GWP and other classification terms.
Regulatory terms
Recover, reclaim, leak rate, and full charge are regulatory terms that appear in refrigerant compliance language. For wording that matters in the field, check the quoted definitions in the rule text and compare them with the reminders in HVAC Refrigerant Log.
What does reclaim mean?
Reclaim is a regulatory term, and its exact meaning should be taken from the cited rule text rather than from memory. The same is true for recover, leak rate, and full charge, which should be verified against the current regulatory source before use in logs or reports.
Reference only. Verify with manufacturer data and gauges. Follow the manufacturer chart and EPA rules. This site is not an approval from EPA.