Thanks for the links and all the replies!
Sigh, looks like I don't have the correct set-up for highland neps. I thought that the air-con would be enuff to keep them cool but apparently not. I'll persist with my current system of placing the lowii in my air-con room every night (covered and with a cup of water in the cover) and see how it goes.
When my collection grows, I'll consider getting one of those coolers or a wine cooler as a highland chamber.