Heat Issues

Very new to all this. Long time smoker, rookie grower. First off I have a reasonably sized space. Started out with one 600w batwing hps. No problems with temps for my whole first harvest. Temp was 75-76 with light on. Around 68 with the light off. K now within the last two weeks I have introduced a second 600w air cooled hood hps. Ran 6" duct, comes from intake connects to hood then another piece of duct coming from hood to 6" 345cfm inline fan pushing all air out of room. Also have upgraded intake to room with a 165 cfm 4" active air inline fan. There is moderate exhaust in the room as well, a 120 cfm exhaust fan 4". Temp runs 82-86 now with second light running. Not sure if both lights need to be air cooled. Any suggestions would be great, need to get temp back down. Do I need to Increase EXhaust? Future plans will be to purchase carbon filter. Will that help temp. I have 3 fans running in the room. Just trying to figure why temp will not drop back down. THanks

well the low 80's arenot bad, u might need to air cool the other light, and a carbon fliter with slow down your air movement how much i am unsure

Make sure you don't just add more fans - they will just move the hot air around. You need fresh cold air in there.

my intake room is approx. 65-70f deg. Its a basement. I don't want to have to add a a/c. No windows for exhausting it. The exhaust room which is in basement as well is down the hall under 20ft.