I’m still in veg yea once I start flowering or start smelling I’ll close it upAs long as you close it all up when the lights are off during flowering it won't hurt the plants. You also won't be able to do much about odor control unless you're filtering the entire room the tent is in, but perhaps smell is not a concern in your case.
Yea it’s fairly warm when I have the doors open is the only time my temp and humidity at perfect conditionDepends on how cold it is if it is cold dont but if it is warm in your house go ahead