Help! Why is my tent heating up so bad

Guys, thanks in advance!

This is my first post on here and I'm on my second grow ever. I just upgraded from 2x 300w viparspectra to a MarsHydro TLS2000W grow light. I thought that this was supposed to produce a lot less heat but I still can't keep my tent under 80 degrees. It's indoors and the room around its ambient temp is only 72. The tent is only 3'x3'x6'

Right now my air intake is passive. As a test I'm just doing a 6" straight pipe for intake (didn't fix the issue). It's on the lower right side of the tent by the AC vent for the room.

My exhaust setup is a 395 CFM VIVOSUN 6" fan and a GHydro 6" carbon filter (425 CFM). The exhaust exits the roof of the tent and has two 90 degree turns pointing it to the opposite side of the room from the intake.

This has been a constant issue for me, I recently upgraded to that 395 CFM fan from a ~200 CFM fan and it didn't take care of the problem. I am seeing a decent amount of negative pressure. Should I stop doing passive intake and get another fan?

put a portable ac in there, im running an ac and a deumidifier (ac is on on dry mode).

You are in the zone for LED's 78-82 is perfect

Ok, so a couple of things... You went from a total of 260 actual watts, to 300 actual watts, and when heat is concerned watts are watts. It doesn't matter if you have 300W of HPS, MH, LED, T5, CFL, or a motor that draws 300W...they will ALL produce the same amount of heat. You need to open up more passive intakes so the fan can pull more air through the tent and you need to vent it out of the room to keep the heat down.

im running between 23-25 73 -77 for my american friends

igrowpot87 said:

im running between 23-25 73 -77 for my american friends

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That's low for an LED grow. Mid 80s is better.

TreeFarmerCharlie said:

Ok, so a couple of things... You went from a total of 260 actual watts, to 300 actual watts, and when heat is concerned watts are watts. It doesn't matter if you have 300W of HPS, MH, LED, T5, CFL, or a motor that draws 300W...they will ALL produce the same amount of heat. You need to open up more passive intakes so the fan can pull more air through the tent and you need to vent it out of the room to keep the heat down.

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i agree think of it like shotgunning a beer u need a vent to create a good air flow

TreeFarmerCharlie said:

That's low for an LED grow. Mid 80s is better.

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its really hard to keep the humidity at 40 percent with temps in the 30s or mid 80s for my american friends

so venting outside isn't possible but I've got the exhaust pointing across a pretty large room. I tried opening the flaps on the tent but it didn't seem to drop the temp even with the additional intake. I was thinking about running a section of 6" flex ducting straight to the AC vent instead of having it right by the tent ~3' away. The ambient room temp is only 72 degrees.

SpawnOfVader said:

so venting outside isn't possible but I've got the exhaust pointing across a pretty large room. I tried opening the flaps on the tent but it didn't seem to drop the temp even with the additional intake. I was thinking about running a section of 6" flex ducting straight to the AC vent instead of having it right by the tent ~3' away. The ambient room temp is only 72 degrees.

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venting outside is possible if you buy the ducting or move the tent or both its no that expensive. venting outside is always possible

Part of the problem is your venting your tent into the room.
The other point is you've upped your wattage.
The other point is your thermometer is in direct light and that could make the reading a couple of degrees higher than it actually is.
It may also be partly to do with vivosun making budget stuff, you could be losing a lot of cfm if your fan doesn't handle resistance well.

But the good news is as already stated mid 80s is a good range for LED so stop worrying about it.

Thanks for the tips everyone, I'll stop worrying so much. BTW this forum is AWESOME! Never expected so many responses so fast! Been worried because my last 4 plant run only net ~1 oz per plant and the buds were fairly loose and airy. Want to make sure my setup is solid for this run.

igrowpot87 said:

its really hard to keep the humidity at 40 percent with temps in the 30s or mid 80s for my american friends

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But you are running a dehumidifier? Your humidity will drop when you raise the temp.

igrowpot87 said:

venting outside is possible if you buy the ducting or move the tent or both its no that expensive. venting outside is always possible

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It's more a visibility thing. I live in the middle of a fairly major city/busy neighborhood and the only room I can fit the tent in is at the front of the house.

SpawnOfVader said:

Thanks for the tips everyone, I'll stop worrying so much. BTW this forum is AWESOME! Never expected so many responses so fast! Been worried because my last 4 plant run only net ~1 oz per plant and the buds were fairly loose and airy. Want to make sure my setup is solid for this run.

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Well you would have to try hard to not beat that with the new light.

Veg , train, fill your space, remove lower bullshit after flip and you should do well.

i got a lot of fresh air coming into my area, i take in air from outside and vent in into my room while venting air out at the same time, its why i need two dehumidifers like i dont need it.. i want it. youll get mold eventually if you keep venting in your room. id get a portable ac or dehumidfier run a constant drain hose (if you can )

SpawnOfVader said:

It's more a visibility thing. I live in the middle of a fairly major city/busy neighborhood and the only room I can fit the tent in is at the front of the house.

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just run duct work to a piece of plywood and fit it in a window people will think its a portable ac

SpawnOfVader said:

It's more a visibility thing. I live in the middle of a fairly major city/busy neighborhood and the only room I can fit the tent in is at the front of the house.

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Get a louvered vent cap, make a simple insert for your window, and people will just think it's from a portable air conditioning unit.

igrowpot87 said:

i got a lot of fresh air coming into my area, i take in air from outside and vent in into my room while venting air out at the same time, its why i need two dehumidifers like i dont need it.. i want it. youll get mold eventually if you keep venting in your room. id get a portable ac or dehumidfier run a constant drain hose (if you can )

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Thanks for the tip! I have a dehumidifier I run during flowering but I live in Oklahoma with the AC running 24/7 so the ambient humidity never goes over 60% in my house, the tent is generally only ~5% higher than the room max.

I like that option for the exhaust, will look into setting it up over the weekend.

Put a fan directly on the mars.