I'm not saying that ad blocking isn't stealing, there could be a case for that especially if T&Cs specifically require that ads aren't skipped, blocked, or avoided.
My only point there was that shoplifting and ad blocking are very different things. Stores don't make their products freely available to anyone willing to walk past enough ads along the way.
Are you stealing?
The aircon have a cost. Cold fresh air cost electricity that costs money.
The price is to buy stuff from the shopping centre, that gives money to the stores that pay a rent price for the local that pays for the aircon bill.