ive been making upgrades as summer is coming ,like a chiller and iwaki pump im waiting for .. AC is next on the list along with another exhaust fan/filter. My 2 lights are aircooled pulling air threw the hoods from another room and exhausting into another room . Normally without AC id run a fan with filter exhausting room . if i add AC do i still need to have a fan exhasuting the room for air exchange? if so , wouldt that just make my AC work harder? . or can i just use fan and filter to scrub the smelly air in the room. thanks