Neighbour cannot forcibly remove the out door unit of Ac 

2) kindly clarify whether society has taken any objections to installation of Frisian pipes and out door unit of ac 

3) in event any legal proceedings are taken by neighbour take the plea that it so’s fo e within wall area of your apartment and no drilling has been done in his premises 

If you are within your rights,  you do not have to be scared about your upper floor neighbor. 

It may be due to his concern about his property getting damaged without ascertaining the facts. 

If possible you may convince him and let him know that you are well within your rights and your actions do not infringe his rights nor there's any possible damage to his property. 

If he is not convinced and still insists on his own assertions adamantly,  then you may inform the association about this and seek for its intervention. 

If the situation do not improve then you may issue a legal notice warning him to refrain himself from interfering in your possession and enjoyment of your property or to face legal consequences. 

Outerwall is under the common area and not under any apartment owners ownership. Its in the ownership of society or association

- As per rule , the external wall of your apartment is the part of your apartment. and you have legal right to use the same for your personal use and facility .

- Further, the society or other members having no right to restrained you from installing the AC coil etc. without passing a provision in the GBM of the society. 

- Hence, you can give a compliant before the management of the society of the said apartment against that neighbor after stating that you are drilling the wall of your concern only and not him. 

- Further, if no response , then file a compliant before the registrar, if the society is registered, otherwise you will have to file a petition before the court for restraining the said neighbor from interfering in your said installation. 

Outer surface of a house/flat of wall belongs to person residing inside the  house/flat. Such owner can drill, drive nail, white wash the outer surface provided there is no damage caused to the structure. You have every right to install ac by drilling a hole. If any person removes or damages it, he will be committing offence  of distruction of property.

As you say you need to drill the hole above your lintel level but below the ceiling slab level, you are well within your rights to do so and your neighbour above cannot legally protest. 

Dear Client, 

You have the right to install AC by drilling a hole your neighbor cannot remove or damage it.