hi there StephensonC.
i had two batches that i hatched, can't recall which one i bumped into, but i had about an 80% hatch rate on each batch. so, i'm going to say there was no negative effect.
i think yours will be fine too.
good luck and let me know how it goes.
so sorry about your losses
can you put bowls in the freezer with water at night and then put the big chunks in the coop during the day? might be able to keep the heat down a little.