Jeff: Even though the box is insulated, it should remain the same average temperature as the backstage area in which it sits -- it will just fluctuate more slowly as the room conditions change. That should be good for the piano. At this point I'd suggest monitoring the relative humidity in the box and in the hall itself, and piano pitch changes, and see what's happening. That will tell you if some climate control inside the box would help or hurt. For best stability in a non-climate controlled hall, conditions in the storage box should adjust to follow the average seasonal hall conditions. Then the piano will be most stable when moved from the box to the stage and back, but will be protected from daily changes in the hall environment. A couple of digital hygrometers would be handy, especially the Airguide model that records high and low readings over time. You can leave one in the box and one outside, then check back periodically and see what RH and temperature swings have occurred. Pianotech sells that gauge for $42.00, and Radio Shack has a recording one for around $29.00 now. Bill Spurlock
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