Heat/light question

I recently got a 39'x39'x76' grow tent and am going to be using a 400w setup. My reflector is on the way so I turned on the fan, hooked up the thermometers and hydrometer to see what the temp and stuff would be without the light in my room it's at 69° with humidity of 46% how much will the light bring that up. I'm gonna have ventilation as well of course any idea though sorry if that's too vague. I'll be growing four plants in 6-7 gallon pots in soil

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With a 440CFM inline fan and my 400w in a cooltube, my temps go from 68 to 78 when lights go on, and it is currently winter; my apartment is cooler than normal. In summer, I struggle with keeping the tent below 83 (I don't have air conditioning).

-spek

Hm. So my 160 cmf fan probably won't be enough?

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i have pretty much the same setup in my basement closet. 440cfm fan 400 watt air cooled tube. my temps hover at 79-81 with lights on and 68-70 when lights are off. I also have a 4ft 4 bulb high output t5 in there filled with 6500k bulbs to help along my 4200k mh bulb (more spectrum) since the only 6500k mh bulb i can find is over 100 bux the only reasonable priced mh bulbs are only 4200k =(

I ran a 170cfm, 400w HID, cool tube, dedicated ventilation for room (140cfm) and fixture, 2' X 3' X 10' closet, intake temps of 73 degrees. Summer: I had temps approaching 85 degrees at the canopy. Winter was no problem because my intake temps went down. Ended up going with LED for summer run. Good luck, should be fine as long as your intake temps are in the low 70's. You can see my setup back on my profile and albums - equipment.