Second Grow Upgrade from closet to Spare bedroom. Need help.

Alright so I want to start a grow, Because I just got my cannabis card. Anyways this going to be my second grow once i get it started. My first grow was alright, it was a fun learning experience. I still have a lot to learn. I ran a home made hydro system in my closet. Nothing fancy Just a 400 watt hps on a light rail and some rubber maid tubs with a top feed type system. I ran into some problems and would appreciate some help.

I got about 750 bucks to play with. I know I want to upgrade to a 600 watt hps for flower, my old 400 watt is switchable so that for veg. I also know i want to grow these in the stink bud system. But here is my problem Ventilation. I want to avoid having to cut any holes in the wall. I have a spare guest bedroom that I was thinking of moving the grow to. So here is where I would like some help.....

I was thinking I could get a Tent for the room 76"x76"x78" (Because I eventually want to have two lights int the tent). Put a piece of wood over the window and cut a hole get a fan that pulls air from outside into the tent and then have it exhausted out into the room. Also I get some really hot summers, I live in the central valley. It can easily reach triple digits.

Anyways here is my questions
-Do I need to run a ac in the tent or do you think i can get away with running the lights during the night?
-What kind of cfm's do i need for this on the Fans?
-Anyone see anything wrong with my idea? or anyone think of something better?
Well thanks I hope you guys get back to me. I really like this site. Never really post anything this is going to be my 1st. I'm on a budget so yeah.
Anyways I know I'm new and I'm no grow guru but get at me guys I would love the help.
Keep it lit. :joint:
 
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