You could make a coldframe -what they call a hotbed around here. Glass on top facing more or less south. We have an atrium with a gass roof, which is the same principle, and get stuff dried real well with minimal atention. Just have to lay it out on a screen door and hoist it up to the top. Don't know how many pumpkins and green beans we drien last year, as well as peaches and apples. For ventilation, we used a desk fan. Not high tech, but works well.