Hi. Welcome to Just Answer.
What is the make and model number of the unit, please?
Okay, Tami. Thank you
At the back of the unit is the compressor and condenser coils. Pull the unit out and see if both are warm. If the compressor is warm but the condenser coils are not then you have a low refrigernat condition. This will require that an EPA certified service come out and recharge the unit.
Unfortunately this will not be a DIY repair.
If both compressor and condenser coils are warm please let me know.
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Yes it is odd, but there may be a reason that the refigerant leaked out.
When a unit is charged there is a small amount of lubricant included with the charge. The lubricant is only to keep the seals in the compressor from drying out. If a unit is left powered down for an extended period the seals can dry out and allow the refrigerant to leak. If that has happened here then the recharge will resolve the problem.
To keep the seals from drying out you might have a neighbor or care taker fire up the unit once a month just to circulate the lubricant and prevent this from happenoing in the future.
When the tech comes out to recharge the unit he can do a test to see where the refrigerant has leaked out. If nothing shows on the exterior componants then the leak was in the compressors seals.
Then it is a hardware failure. Cracked tube, bad solder joint, etc.
You are welcome.
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