Temp with Airflow

So Going to start my first run this next week and I'm just trying to do some last minute homework. What I have, 2 600's in my 8x4 tent, which is located in my garage. Temps wont get below 60 in my garage, but i'm wondering, would I be best to let my hoods vent inside my tent for the extra heat, and run a passive input or two? I will be running a Carbon filter and an inline to exhaust everything out of my dryer vent. Just wondering because I think I might be lacking heat once all is said and done, so a straight shot through my hoods doesnt seem logical. Any suggestions? My tent has 8 vent holes if I recall, so I can literally put one almost anywhere.

Now granted I will be running 18/6 and I will have both lights on at night when its the coldest, will heat be an issue for me? Or am I just being over concerned about how to vent this thing?

any ideas?

I have had some issues with temps being too low as well. I was thinking of doing what I think you are trying to describe. Have one fan always on and attached to filter to handle smells, and a separate fan on the lights with a timer or temp regulator to maintain heat at a certain level. This is in my veg room so I was thinking of not even having the second fan. Just temperature regulating the one inline fan with the filter. I don't know how much smell would build up however without constant filtering.