I have both, and several BPI certs. I never try and group the energy side with the inspection. The cold truth is just about every house stinks on the energy side of it. No one in these parts even makes a half-ass attempt to air seal, insulation in attics are 6-8", etc... If people actually understood what a difference it makes, they'd jump all over it. I went nuts on my house last year, and cut my bills by nearly 35%. I was cash flow positive in 8 months. This past summer, when it was crazy hot, I could make my house as cool as I want. 65 felt nice when it was 100 outside. I tell my people if you buy the house, call me back and we'll do a full audit (which can take 2-3 hours in itself). I may talk about the high points during the inspection, but nothing in the report.