Refrigerants
Refrigerant types, phase-downs and the A2L transition.
11 entries
- 01Superheat and Subcooling: What Each Reading Actually Tells YouSuperheat and subcooling only diagnose a system when you read them together. Here is what each of the four combinations points at, which one to charge by, and why none of it is a Section 608 requirement.8 min read
- 02R-454B PT Chart: How to Actually Read the PressuresA PT chart for R-454B prints two saturation numbers, not one, and using the wrong one throws your superheat or subcooling off before you touch a valve. Here are the real pressures and which column each calculation needs.8 min read
- 03How to Find a Refrigerant Leak (and What Section 608 Requires Next)Most leak-detection guides stop at the bubbles. Here is how the methods actually rank on a real system, and what federal law obliges you to do once you find the leak.9 min read
- 04R-22 Replacement Refrigerant: What Actually Works and What Doesn'tEPA's SNAP program lists more than a dozen refrigerants as acceptable R-22 retrofits, and none of them is a true drop-in. Here is what changes on the job and what Section 608 requires while you do it.8 min read
- 05Is R-22 Still Available? What You Can Legally Do With ItVirgin R-22 stopped being made or imported on January 1, 2020, but R-22 was never banned to use. Reclaimed and pre-2020 stock keeps existing systems running legally.8 min read
- 06Refrigerant Safety: Why a Large Leak Can Cause SuffocationA large refrigerant leak kills by displacing oxygen, not by poisoning you. Here are the four physical hazards the Core exam tests, the PPE that actually works, and which of the controls come from Section 608 rather than from OSHA or ASHRAE.8 min read
- 07Types of Refrigerant: The Classes You Actually Need to KnowRefrigerants get sorted three separate ways — by chemistry, by appliance pressure, and by ASHRAE safety group. None of them is the same thing as EPA 608 Type I, II and III.8 min read
- 08R-32 vs R-454B: What Actually Changes on the JobR-32 and R-454B are both A2L refrigerants replacing R-410A, but they are not interchangeable and they do not sit the same distance from EPA's GWP limit. Here is the difference that matters in the field.7 min read
- 09R-454B Explained: What It Is and What Changes on the JobR-454B is a mildly flammable zeotropic blend that has replaced R-410A in most new residential equipment. Here is what it is made of, how it behaves on the gauges, and which of the handling rules actually come from Section 608.7 min read
- 10A2L Refrigerant Certification: What EPA Actually RequiresSearch for A2L certification and every result sells you a course. The federal requirement is Section 608 — here is what is regulation, what is building code, and what is only your employer.7 min read
- 11The R-410A Phase-Out: What It Actually Means If You Service HVACThe phase-down restricts what may be manufactured and imported, not what you may service. R-410A is not banned, and EPA removed the installation deadline in 2026.7 min read