I have a serious problem alert

Well I get 2 temps, 1 is 87°f with 43% humidity on my ac infinity n on my little acu rite little gauge reads 85°f and 35%humidity

See my door was thinking making a vent at bottom

It's really a process of elimination and experimentation. If you can't shorten the ducting run, or smooth it out, and if you can't try venting inside to an adjacent room to lower the negative pressure in your house and imprive your central air's efficiency, then you are left with trying to pump more cold air in via a second fan, more passive intakes, or additional A/C (window a/c, in room a/c). If that doesn't work, then you need to start removing heat sources by scaling back (dim lights, less lights, etc.). There's no magic bullet for this one.

You could also leave the door open during the hottest parts of the day, and close it at night.

Note: If you start looking at a/c units, you then need to start looking at split units, dual hose units, window units, or single hose units, etc. I would stay away from single hose units, they will create new problems because of the way they work. Dual hose, split and window a/c units keep the conditioned air separate from the radiator air used to cool the coil. Single hose ac units work like an exhaust and will suck smell air from the room across the coil and out of the room letting everyone know what you are doing.

The door will help, but I couldn't tell you exactly how big to make it. Just remember that whatever you put over it to make it light proof will actually restrict it, so you will want to make it larger than you think.

Where is your exhaust in relation to the door and current floor vent? They need to be as far apart a possible. You don't want the air coming in and getting sucked right out, you want it to have to travel across the room getting mixed by your oscillating fans. If they are close, you could try run a duct from the floor vent across the room away from the exhaust so the A/C air comes out somewhere else and gets mixed better.

Not sure if this is giving you ideas. But this is basically THE main battle, environmental control isn't cheap, and is probably the most difficult to solve. Just when you nail it, the seasons are going to change and throw you off again, you're probably going to need seasonal changes to your plan to keep it in the zone.

I know there are much cheaper options, I got my 2 8"x8" on sale. This is a larger one, seems to say it would let 400cfm pass through.

Ok well ima do this for thing n see, I think right now it's perfect, with 2 evaporator cooler I got, but the door vent would just be cherry on cake for me to be in more controll n take some load of my cooler , question that adorama vent, is that also like a fan with in cuz I have no clue why it is that much?

Nope, no fan, just spendy, Like I said, there are cheaper options. My laziness and a desire for a black finished look sold me.

Hahaha bro lol I'll just go outside n spray paint the sucker's black
Well ima do this for thing n keep this chat updated

What u think about this idea

Hey guys just a update , these r my temps n RH
I made a vent in door at the bottom,
Can anyone help me with a idea to get a consistent RH n Temp.

A co2gas generator will let you run a little hotter not sure how much you would need for your grow room might help a little

U think a big evaporator Humidifier work?

SkyFox said:

U think a big evaporator Humidifier work?

Click to expand...

You want a swamp cooler also known as an evaporative cooler. An evaporative humidifier is just going to raise humidity, an evaporative cooler cools and raises humidity.

What CFM for a 12x10x8 room with 5 sf 4000, inline 8" with carbon filter?

Would this work for me?

I would go with one rated at least 30% over your square footage to account for the wattage you are running in the room. The only issue with a swamp cooler is that it cools and humidifies simultaneously so if your RH is getting too high and you still need to cool the room further you will need to run a Dehu or find some other way to lower the RH.

Dammit... hmm so hard to get this right n I see other do it with no problem. Any suggestions?

Or should I get a evaporator Humidifier?
Cuz I read when u raise humidity, u lower the temperature.. is that right?

SkyFox said:

Or should I get a evaporator Humidifier?
Cuz I read when u raise humidity, u lower the temperature.. is that right?

Click to expand...

Just remember, your are rapidly sucking the air out of the room and replacing it with the air coming through your vents.

CO2, humidifiers, and dehumidifiers are going to struggle to keep up.

I know that humidity and temp are intertwined. Raising temp makes room for more humidity, but with nothing transpiring in the room, your humidity drops as the temp rises. It's going to be hard to dial in your humidity without plants in the room as they will totally change the rh.

Your last screenshot shows 84 and rising. What did it peak at? I'm going to keep mentioning this. 84/85 is hot but I am hearing this is the top end of where you would want an LED grow.

You never did address my suggestion of dimming even just like 5 to 10% on each light might take the edge off.

Also, what if you run your lights at night? Do you get high temps all day, or just at say noon when sun is hottest outside?