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Higher than it's set at when it freezes. I've never had a freeze up, and I keep my temperature setting at 68F. However, I seldom drive more than a few miles, so even when the humidity is gosh awful it's never on long enough to freeze. I bet the firmware update reduces the duty cycle of the compressor to prevent it from happening.
I had this happen in a motel I worked at that had undersized AC units. People would check in, crank the AC to full, and on a humid day they'd freeze up within an hour or so. Sometimes the ice on the coils was an inch thick. We eventually cured it by doubling the BTU size of the air conditioners, but as a stop gap I rigged the existing units so that they couldn't be turned to lower than 72F. That kept the compressors from running constantly and almost eliminated the freezing.
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