need help with temps

temp is going to low at night so i put a small portable heater inside at 70 away from plants what is the low of temp and whats the high

seems like yo have it nailed. optimal daytime temps 73-82 with nighttime diff of 10 degrees or so. I keep mine at 64 at night with no noticible issues. when you start getting into the 50;s you will have problems.