Hi everyone,

i am new to this forum.I need a help from you guys. I always get confused by the term Air Change in air conditioning. I mean what is this? the recirculation rate or an ordinary AC or supply and exhaust of fresh air? if it is recirculation rate , then how cad it add latent and sensible heat to the room? if it is the second one, how can we practically supply fresh air in a closed bedroom where a small single split unit is being used?

please help. thanks in advance