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It's an air conditioning system, not a cold air system. What the heck does that mean? The air conditioning system not only cools the air, it pulls moisture out of the air. That's why you run the air conditioning system even in cold weather to keep your windows from fogging up.
If you talk to air conditioning system technicians, you will quickly find out you're supposed to run the system at least 30 minutes total per month to keep it lubricated regardless of temperature. If you don't drive the car very much, just run the system when you periodically start the car for lube purposes.
A properly operating air conditioning system does not need recharging every two years. It is a sealed system. If there are no leaks, there is nowhere for the gas to go. The oil, on the other hand, can be consumed via friction.
In OP's case, I'd be inclined to think there is blockage, most likely at the orifice tube from OP's noise description.
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