nowhere
Never, unless you have a leak.
Freon is stored in the compressor unit of an air conditioning system.
Adding freon to an air conditioning unit should only be done by a certified technician. It is in fact illegal for anyone to add freon to air conditioning that isn't properly certified, so one would add freon by calling in a certified technician to do it for them.
A reputable HVAC service Co. will locate and repair the leak and recharge your system.
in the air conditioning unit
overcharging a central air unit system with refrigerant(freon) will cause the head pressure to be?
To cool more than two rooms it is economically more efficient to purchase a central air conditioning unit than a wall unit. Wall units are individually cheaper than central air, but if you have to buy more than two, then it is better to buy the central air unit.
where do I add freon to my air conditioning unit on a 1997 chevy truck?
it will break the unit
Freon is odorless, non-flammable, and is not corrosive. It is unlikely that's the source of your discomfort. Moreover, if your central air unit sprang a leak, it wouldn't take long for the freon to discharge completely. Your unit will no longer being cooling. If it's still cooling, even inefficiently, it's definitely not the freon.
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