Hi Dmtmind
Boy,do I feel your pain. My bin heated up recently using raw rice. I don't know about bamboo leaves, but if you haven't done so, take the cover off your bin and let it air out. You can loosen the bedding somewhat to get the air to it. Add some shredded paper and cardboard to the bin.

Some people put a couple of frozen bottles of water in the bin to cool it down as well.

Good luck!!

Sherry

assuming you don't have it sitting out in full sun with a lid on - if the bamboo was green, then like any green plant material [think grass clippings], they're high nitrogen, which will always heat up - you should be using straight carbon material for bedding, like newsprint, cardboard, sawdust or very dead dry brown leaves, all of which hold a liberal amount of moisture without the heating of bacterial decomposition

Bill

Thanks for the tip about frozen water bottles Sherry. The bamboo leaves are brown as they have been laying in the yard.Another thing is my bin didn't have any drainage holes. It was on the back porch in South Florida 90 degrees. Maybe I didn't get all the coffee grounds out(do they have a tendency to heat up?). Thanks for the response Bill. How wet should the bedding be a few squirts with a water bottle mister? Thanks

I have drainage holes in my bin - so when it is a hot day, I toss in some ice cubes. I've done the frozen bottle too. But my worms aren't in full direct sun and I don't think it is as muggy here as in Florida. . .poor wormies.

wet enough to nearly squeeze water out of - worms breathe the oxygen in the moisture on their skin .... even without drainage, too wet is preferable to too dry, they can stay above the water, but dry skin = suffocation

if the bin is getting direct sun then the temp inside it will be hotter than air temp, regardless of what bedding is, needs to be shaded all day long - coffee doesn't have enough immediately available nitrogen to generate heat

Bill

My bins are doing the same thing! After temps in the 40s last week, it's suddenly 96 today! Yesterday, when it started heating up, I brought my bins inside and put them under the kitchen sink. Today, they're really warm inside and creating a lot of condensation...I can't seen any worms because it's really dark in the cupboard, but I tried shoving ice cubes down into the bedding, evenly spaced to cool it off. I'll try leaving the lid off to let it air out and maybe more ice cubes...I don't have any frozen water bottles handy, but I'll get some started for tomorrow.

I've only had worms for a few weeks! I don't want to lose them!

There were a lot of great suggestions in this topic, so thanks!