I believe a little cooler is better than the heat in July and August. Ted Petit does his in an air conditioned trailer in Florida because of the heat. I think he said he set the temp on 65, not sure, but a lot cooler than the outside. Here I set mine on racks in the shade for the same reason. There seems to be a misunderstanding by some that seed needs light to germinate, they only need light after they sprout. Good luck to both of you with your seedlings.