Environmental issues

I want to explain my setup and then have some input where I can make some changes. I’m growing indoors in a 8x10 room. I’m using a 4x4 grow tent and also a 2x8 closet. I converted the closet so that it’s completely sealed. I took the doors off and replace it with a grow tent door and panda film. Now I have a 6in exhaust inside my 4x4. I’m using passive air for my intake. Now in my 2x8 I have a intake and exhaust. I’m pulling air from outside and exhausting inside the room. Temps outside drop to low 50s at night so I have to use a heater. I have the heater set up outside both grow areas. With a humidifier inside the 2x8. My problems are I can’t keep the room hot enough for my led lights. My room stays around 72 degrees with the heater running every 30mins. Which causes my humidity to drop to low mid 30s. Anyway I can redo this setup. Worried about light leaks also. Thanks.

Ya, stop intaking from outside.
If you have central air, or even just an air vent in that room, stick your intake hose right inside it. That's fresh, Co2 rich, filtered, outside air you'll be pulling.

I will try this. Only reason I didn’t do that at first was because I removed my ceiling fan so my tent could fit in my room. And it left a 4 in hole. Perfect for my intake. Lol. Thx.