Should i

leave the fan on over night or should i turn it off when i turn the lights off at night i been leaving it on this whole time its been like 5 weeks

i just wanna see what u guys think

Is your fan an occolating fan or an high turnbine fan? I keep my exaust fan on 24/7 because when lights on they are 22degrees and when lights off they drop to 19 degrees. Perfect for me.. But if it gets to cold, keep fan off when lights off... I like it on becuase it keeps air pulling into my basement from all the cracks in the house, and it turns my air in fan by convectional pull.
If its your air in, and temp is cold out (depending were u live) time your air in when lights are on, and turn off when lighs are off!! good luck

its just some little fan its like 2 or 3 computer fans in one so i think its ok for now

thanks for the info i dont got a thing that tells me what degrees it is but i will get one

lol yeah those degree teller thingies are call thermometers lol.Leave the fans on inside unless it cools the area way to much as you want air movement at all times