The Kuul Pad system I created for cooling my GH in the summer doesn't work very well. Sure, it lowers the temps enough, but it also kills the RH to the point that I only have 15% at times (orchids don't like that). So this summer, I've decided to get an evaporative cooler. My only issue is that I'm not sure how to appropriately size a unit. Here's what my stats are: Volume of the GH: 800 cubic feet, +/- 10% Shade cloth: ~50% Outdoor RH: 5-30% Maximum temps outside: 110f Maximum desired GH temps: 90f What are your thoughts on how I should determine the capacity of a unit? I don't want one that is so large that it cycles on and off every 5 minutes, but I also don't want one that is on all day.