Inline fan is making room hotter..

Just bought a new inline fan and it actually raised my temp to 81 vs the previous 188 cfm fan.. I have a switchable ballast and right now its at 500 watts.. The issue is that I want to turn up the watts when my plants get bigger but I dont wanna fry em. Any ideas.

Outside temp 75-80
1000 watt air cooled mh
440 cfm inline fan (On top of tent sucking heat through ducting)
6x6x6 tent in a 10x20 ft room
188 cfm 6'' exhaust/intake fan (I switch it around sometimes)

You have to exhaust to a different room, you're moving so much air you are just recirculating the air in the tent with the hot air you are exhausting from the top. Get an A/C unit for the room, or turn your central A/C on. You can't intake hot exhaust air and think it's going to drop the temp....

if you ambient temps are 75-80 there is NO amount of fans that are going to make your temperatures lower..

alotaball said:

if you ambient temps are 75-80 there is NO amount of fans that are going to make your temperatures lower..

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Agreed. You need to vent your exhaust out to another room or outside, and then get the temp closer to 70 outside so when its gets inside the tent, it doesnt go above 80. 80 is usually the highest temp you want to see in an indoor grow room. If you can get it down to 75 inside the tent, your plants are going to be a lot happier.

you could also try venting into the attic. be careful u dont start a fire with insulation though.
once u do that, u can get an a/c for the room. now cold air will be brought into the tent, sucked into the light(it would cool the light better also), then into the attic. your electricity bill will go up though. and i think the a/c would constantly be running

If your humidity is low enough .. and you buy a ac for the room.. you can turn down your exhaust so the cold air can build up in the grow room.. .. just something your gonna have to play with .... to be honest.. you need to have your house or ambient temps .. in the low 70's to have a chance.. even with a STELLAR fan setup.. you will be lucky to keep the tent within 5 degrees of your room temp.

alotaball said:

If your humidity is low enough .. and you buy a ac for the room.. you can turn down your exhaust so the cold air can build up in the grow room.. .. just something your gonna have to play with .... to be honest.. you need to have your house or ambient temps .. in the low 70's to have a chance.. even with a STELLAR fan setup.. you will be lucky to keep the tent within 5 degrees of your room temp.

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yeah i forgot, that ac is going to raise humidity so watch for that as well

Luger I dont know if you noticed this ..but this is the problem I have had with ac

If you get an ac and its ALWAYS ON .. it will lower your humidity.. which is cool.. but if its always on .. its gonna cost you and arm and a leg electricity wise..

If you buy a LARGE ac that has plenty of cooling power for the room.. and it actually cycles on and off.. you get this really dry air while its on .. then damp humid air once the compressor cycles off ... Kinda like in your car if you turn the ac off and just put it on fan .. you get this damp air.. that can be a problem.. So its a fine balance..


OP do you have anyway to lower the temp of the entire house to somewhere between 70-75 degrees?

Nice, I hooked up some extra ducting to the outside of the inline fan and have it blowing out the gap between my garage door. It lowered temps from 81 to 77. Thanks guys!