I run a window AC unit at 62 on high. Dehumidifier is set to 65% RH. This is what works for me. I have light out during the day as it keeps Temps up on the plant's. So the ac goes off during this time and heat from outside keeps them warm during lights off.
It's just a game you'll have to play to figure out what works for you.
The more vents you open on your tent the less cold your lung room needs to be.
Everyone conditions are different and won't work for yours. But hopefully with a little tweaking you can get yours dialed in. Goodluck growmie