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Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere.
Henmueller suggested that cars should idle one to two minutes before driving in cold weather. When temperatures drop to freezing, or when it's cold enough that windshields will frost over, the oil needs to warm up before it can move smoothly throughout the car. How temperature changes affect tire pressure.