I avoid use of aircon but today at the begging of the others in the house I relented and switched it on .... nothing but warm air .
oky so tomorrow off to find someone who will come and regas it pretty sure that is all it needs its only a 1.5 HP anyone have any idea what they should charge abouts ?

Thanks ya all ... I will let you know the outcome

Dirty air filter: A dirty air filter can restrict airflow, which can cause the air conditioner to blow warm air. Check the filter and replace it if it's dirty.
Refrigerant: If your air conditioner is low on refrigerant, it won't be able to cool the air properly.
Reasons why the refrigerant could be low:

• Over time, the joints, connections, or coils in the refrigerant lines can develop leaks. The leaks can cause the refrigerant to escape from the system, reducing the system's cooling capacity.

• Evaporator coil issues: The evaporator coil inside the air conditioner can get dirty or damaged, which can cause the refrigerant to leak out of the system. (how old is the unit?)

• Improper installation: If the air conditioner was not installed correctly, it can result in refrigerant leaks or improper charging of the system. (most likely if the system is not that old)

• Normal wear and tear: As the air conditioning system ages, the components can wear out, which can lead to refrigerant leaks.

Condenser unit: If the outside unit of your air conditioner is dirty or covered in debris, it can't effectively release heat. Clean the unit and make sure there's nothing blocking it.

As others have suggested $10 to $20 once a year to keep it topped off and for $20 they should clean the heat exchangers in the condenser unit (the outside bit) and the evaporator unit (the inside bit)