Keeping them warm shouldn't be a problem down here in South Texas. Keeping them cool enough might pose a slight problem though
if it gets too hot, I'll just bring them inside the house instead of keeping them in the garage.
How many did you start with, and how long did it take for them to multiply?
Also, would you mind sharing a picture of your setup? I'm trying to glean as much info as I can before they get here. Thanks in advance!