It's probably way over complicated but I have considered a zoned temp controlled area accomplished by putting 'gates' or dividers in at various points each with it's own temp controller which would actually trigger a little servo to open or close a vent and/or turn on a ventilator fan.
So your zones would go from;
coldest=closest to cooling or farthest from heating
warmest=closest to heating or farthest from cooling.
just a thought I had.
There's a small brewery in St. Pete that does just this. The cool room has two areas, one for lagers close to the A/C unit and another room closer to the "out" door for ales. They are separated by one of those clear, thick plastic curtains.