I've read quite a bit about raising peppers (bell and hot) on this forum and other various resources.
I seem to find if peppers are subjected to too cool of temperatures, even early in their life, the fruit set may be poor or non-existent later in the year.
I am starting pepper seeds on top of my fridge. After they sprout I plan on putting them on a cold frame on my deck. The deck is on the south side of the house and it is the auto-venting variety. I placed 8 1/2 gallon jugs with water in the cold frame to absorb heat during the day, keeping temperature higher at night. I also built a polystyrene cover that I place over it at night for further insulation. I live in southern Wisconsin and we routinely have temperatures in the 30s at night during April.....my cold frame can keep temperatures about 10F higher on those nights.
I'm beginning to think that is too cold for peppers and I should bring them inside at night and place them in the cold frame early in the morning when I leave for work. Will the couple hours in the cool cold frame in the AM be detrimental to later fruit set?
I'm thinking the same thing might be necessary for tomatoes as well.
Thanks for your insights!