well - i saw a tip - @minismallholding and @cesarj21
I didn't lose too many in the summer - i lost more in the frost.
but I saw a tip for the summer... when you're feeding them - put the bag of veggies into the freezer and then just bury the frozen veggies into the middle of the bin - and it is supposed to cool the bin significantly!
not sure if it works - but if you try it and it does - let me know hehehe