Don't let a sloppy repair cause a callback. Learn the professional standards for how to fix electrical wiring in HVAC, from proper stripping and crimping techniques to critical UL torque specifications.

You might be wondering: if the old stuff was non-flammable, why did the EPA mandate a switch to a new A2L refrigerant that has any flammability at all?

The answer is balance. To create a refrigerant that cools effectively without destroying the environment, chemists had to change the molecular structure.

• Old R-410A: Non-flammable (A1), but had a massive Global Warming Potential (GWP) of 2,088.

• New A2L (R-454B): Mildly flammable (A2L), but drops that GWP down to 466.