I run passive intakes so I grow different temps all year. On really cold weeks my temps have gotten to 58 lights off. Right now been a mild winter it says above 65 72-78 during lights on I’ve never noticed significant slow growth. Still get 1.5-2 a light winter or summer. I leave my fans on high 24/7 I rather air exchange than a few degrees you might old in for a few minutes Longer. My humidity stays between 50-65. Some said if you were locked in a room At 75 and you’d go into shock at 65....You’d probably sleep pretty good at least I do working outside 10 hours in 100 plus weather I set my ac at 60 and sleep like a baby. As long as you have good are exchange and fans circulating it’ll be fine.