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Are you sure that the compressor is running? These have sealed systems and you can't just add refrigerant to them as they have no ports. Some HVAC firms will do that for you...........it depends on the area and how they feel about it. If you can't, then a replacement is going to be the only other option. Let me know if you want to pursue that and I can recommend one for you. Let me know if you want just a standard 13.5K A/C or a heat pump version or if you want to go to a 15K unit. All follow ups are included in our fee.
Check PPL in your area for a decent price. Also check out AdventureRV online as they have some great deals as well. I would go with a 15K unit if possible. I don't know if the extra for a heat pump is really worth it as they aren't that effecient when it gets really cold. Let me know what they quote you.
Is the fan blowing out any air or just the compressor running?
If the fan is blowing out air and the compressor is running, then it is out of refridgerant. Unless you can find an HVAC guy to instal ports and recharge it you will have to get a new unit.
Just checking back in to see if you got this resolved or do you still need some input from me here?