Dwarf baby tears turning yellow?

My temperature in my tank is going up real high right now because of summer. Right when I got my baby tears, the temp would be set at 76-78 degrees and they would be crazy bright green and were spreading within a week. Now the temp has gone up highest being 84-86 and my baby tears are slowly dying! I don't have AC in my house either. Are the baby tears done for? If I somehow manage to get the temp down, will they ever go back to being bright green? They aren't even done spreading yet. I've had them for about a month.