Temperature.

I always am very puzzled about this. Let say that the temperature outside is 30 degrees, then if I were to switch my air-conditioner to 25.5 degrees (the recommended temperature for energy saving), I would probably feel cooler inside the room than outside, isn’t it? I don’t think this part would lead to any arguments, so we’ll have it as that.

But what if the temperature outside is 20 degrees and I continue to have my air-conditioner to be at 25.5 degrees? OK some might say that in this case you don’t really need to switch on the air conditioner so as to save the environment, but what if it is a centralized system and you can’t really switch it off? Would you actually feel warmer inside the room, or you’ll still feel cool nonetheless because the air coming out from the air conditioner is cool air in the first place?

Anyone familiar with these physics theory can answer my question?