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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.
Your IAC {idle air control valve} could be going bad, more then likely its just a vacuum leak. Get a can of carb cleaner and spray lightly around the intake and vacuum hoses. If you hear a change in the engine RPMs or idles different, you found the leak. If no change, IAC valve should be replaced. You can probably go 35 on idle speed,as far as the fluctuation goes add a fuel additive to the fuel,preferably when your tank is low on fuel. Sounds like a vacuum leak, maybe one of the components or one of the hoses at that age of the car. Have the engine computer codes read, they may reveal teh problem.