| Date | Rev | Topic |
|---|---|---|
| May 2021 | 1 | The art of system troubleshooting |
| Apr 2021 | 1 | Do you know the R-410A replacement refrigerants? |
| Jan 2021 | 0 | DOE 2023 SEER Standard |
| Feb 2021 | 1 | DOE 2020 AWEF Standard |
| Oct 2021 | 2 | Ideal gas law primer |
| May 2021 | 1 | R-134a, R-404A and R-507 replacement refrigerants |
| Feb 2021 | 1 | Refrigerant line sizing |
| Jul 2021 | 0 | Thermodynamics for the HVACR technician |
| Nov 2021 | 1 | Understanding the TEV (TXV) |
| Jul 2021 | 2 | WICF heat load calculations |