I also teach the course, and am getting it approved in the midwest states for state CE as well (Illinois, Indiana, Wisconsin, etc). I just don’t travel as much.
Building science knowledge is the key. Many things that have been regularly taught, in the past, are, given “greener” building and more energy efficient building, have changed dramatically.
We see, in the midwest (which has a REAL weird climate, given the Great Lakes influence) many standards, even those enforced by local codes, as just plain wrong and are leading to exessive mold and other problems because of air and vapor intrusion. Many of the new construction houses I am seeing are developing significant mold problems because of this.
One point. Fiberglass and cellulose insullation (thought to be “greener” because it is usually a recycled product) actually looses its R value if not properly sealed from air infiltration or if the proper vapor barriers are not used. Thermal imaging can be used to calculate the actual (rather than the listed) insulation in the walls. I have seen houses that were not properly air sealed where, during winter, the actual R factor os as low as 6 when the “rated” R value is 13 (3.5" fiberglass batt).
The whole paradigm is changing. If home inspectors do not become more educated about this, they will be left behind.
It also helps when you want to branch out fron just doing RE transation inspections to doing building consultations.
Hope this helps;