Hi HH
I`ve seen large differences in the inlet/out temperatures with inlet RH down in the high 30`s. Obviously the higher the RH the better it gets. It was designed to be installed in a greenhouse where excess humidity and solar gain are not in short supply :)

Thanks Hex,
That's what I figured from what I've read so far. Our RH is below 20% most of the year. I have 2 digital weather stations, and the minimum reading is 20% RH. That's all it reads 3/4's of the year until the monsoon season. So all I know is it's below that. But your right a dedicated greenhouse will naturally have higher humidity.

I`m not sure how useful it will be but if you have cold night temps you could run the system at night to discharge heat from the mass. Its a good way to increase the daytime cooling capacity when a less than optimal sized soil mass isnt keeping up with the daily solar gains.