Air Conditioning


I recently moved into a brand new apartment, construction just completed, never had previous tenants. Now, they have put the air conditioning inside the apartment and enclosed it as though it were a closet.
You can hear it and feel the air pressure in the apartment change when it comes on. Is that per code, legal, acceptable???
I never heard of or seen such a thing.
I’m just curious, is all?!?!?!
Can someone reply on this?
Thank you so much.