I have an Apollo 6" inline fan filter combo for my exhaust and apollo 4" inline fans for intake. My tent is 4’x4’x6’. I have a 600w mh/hps light. My temps are runnin in the low to mid 80’s if I don’t have my 16" fan blowing in from the side door when the light is on. How can I lower the temps? When I run the 16" fan as well they stay around mid to upper 70’s. Maybe a small ac unit, or what would y’all suggest?
The obvious solutions is the combination of a vented hood and a AC unit , it really depend on your budget. AC unit gone a cost you more then a Vented hood , so, you know me @Hawkeye_diesel … LED all the way for my opinion 
, lol
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Do you have lower passive vents open?
What is the room temperature the tent is in?
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Yes the passive air vents are open the room it’s in is around low 70’s. I hadn’t thought of a sealed hood for the light. I’m gonna look into those
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In that case, unless you can turn up the fan more, the vented hood sounds like a smart idea 
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Any good links to them? I’m not finding anything good on amazon so far. @Niala I’ve been looking at the led’s, but Jair font have that kind of dough haha. I want one though
You’ll have to change your venting around a bit but I bet it makes a big difference. @Niala 
For the price of an AC unit you can have this
And for 40 bucks more, you can have what I have, the 1000 watts one
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I eventually want some led’s, but for right now I think I’m gonna get a hood and just use my 4" fan to pull the heat out. I think that’ll cut heat pretry well.
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Air cooled hood i my 2x4x7 tent had my tent at 75f light on and high 60’s off
Also had two mars 600’s running too so did well i think
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I had alot of trouble with heat ad i run 2 1000 watt hps lamps then i got smart and bought two hooded lamps and problem solved.
Here iis a link the price isn’t bad at all
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That’s like the one I have in my cart, just waitin for funds haha
Right on brother right on…
Will
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When i ran my hps setup i used cool tube but didnt like it was great if your plant was not very wide narrow field for light spread
My next adventure will be an LED haha
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Dont settle save up get one that has a core coverage the same as your tent if your wanting one light but maybe two that cover 2x2 your tent is 4x4 right?
Yes 4x4 and the one I’m looking at will cover a 4x4 print
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I with you man thats why i got the light i have now viparspectra R900
You say you have a 4 inch in-line fan I’d move it up to a 6 inch like your outtake fan