I'm glad this thread came back around. I've been thinking about having a look at sealing &/or insulating my plenum a bit better...and also painting my outer cowl white instead of the black it is now.
But re-reading this thread, maybe I just missed it, but I see lots of mention of various discharge air temperatures... but I'm thinking that probably really isn't the whole picture. The difference between the temperature at the air return vs the discharge is what you want to look at. Generally a delta of approx 15-20 degrees F (as I recall) is what you'll see if properly operating.
I'm curious if these mods being discussed increased the delta at all?
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