I have a cape cod built in '67 with central air and aluminum forced air ducting. It appears the previous homeowner added some insulation to the roof. However in the summer, the second floor continues to get warm and stuffy even with all the registers wide open, while our basement is morgue cold. Our intake ducting near the fan unit in the basement does have a small louvered vent that I assume is there to draw in cold air into the system when it is blowing, but this hasn't made much of a difference to cooling the house to the best of my knowledge. I'm very curious if there's a "better way" to move all that good cool air that has sunk into my basement to the top floor where it can be put to good use. I have often wondered if perhaps there was some sort of solar air movement system I could use to draw that cold air to second floor, or perhaps some addiitional ducting that could be installed in tandem with a standard electric recirc fan. I'm not wild about having a fan running all the time, which I why I wondered about the solar unit, which could run continuously during the day "off the grid". Anyway, very interested in potential solutions to this challenge, even if they do not incorporate some of my initial ideas.