i have 2 pico scapes on my window sill, no stocks in them tho. I do notice a pretty significant temperature change from when the sun is up and when the sun is down . (i didn't use a thermometer, just by touch it seems at least 10-15 degrees higher)
During the window winter, they got covered with brown algae! lol. But luckily has since cleared up because the sun is staying up longer. It gets about 5 hours of direct sunlight now. i dose with one drops of excel every day. The plants in there seems thriving, but i am not sure if i am confident enough to stock them.
Its why i am watching your thread so closely, lol.