im putting a growroom in my upstairs bedroom. the room is 10by12 with slanted ceiling. i have a 1000 watt. hpmh. new kind of light. im thinking about making the exhaust fan go through the ceiling and into a small attic. on the other side of the room close to the floor i plan on putting a intake fan in. the fan will draw from a huge attic space above my living room. it is unheated and outside air makes its way in. the air intake and exhaust are 2 different rooms. does this sound like a good intake exhaust set up? will the air comming in be to cold during winter? will i need a co2 tank with all that air comming in? should i get a grow tent or just use the room, i will have more space than plants. this is my first grow and i want to do this right.