Too Much Heat -- Can't Fix Problem

He said he has no access to an outside vent.......

Perfect !! Install ice maker in cooler
install drain hose plumbed to plant watering system
auto fill/drain large cooler as needed
enjoy cold grow room, top water, and ice !!!

Yea that will work.......if funds r lows buy an old chest freezer(£20) for an endless supply of ice..

Fish Weed said:

Here are some pics. Exhaust into the left side, cold air out the elbow pvc on the right. Forgot to mention the pvc connection pipe (short one) goes into the rubber gasket on the left to attach you fan exhaust tube to. I use the standard dryer vent flex hose. I had to disconnect mine to move it get the pics. The other pics is of the jugs I use.

Click to expand...

Well done!

Thanks for the input and suggestions guys! I went ahead and picked up another ventilation fan (400 CFM) today to see what I can achieve with just ventilation before I look into an a/c unit.

1x 400 CFM
1x 334 CFM
1x 150-250 CFM (cheap ducting fan)

I would have to figure out how to safely connect my 6" ducting to a 4" ducting for the clothes dryer to vent the hot air out of the basement, but it would also have to travel around 20 feet worth of ducting before making it is great escape, do you think that is achievable with the fans I am working with? I have not installed my carbon filter yet inside of my room, but that will be the start of the air extraction from the actual flowering room before heading down the lengthy travel of ducting.

I'll be using one of the larger fans to air cool my light reflector, and the other to ventilate air into/from the flowering room. However, I do not know where I would place the other two fans, would the 334 CFM fan be used for air intake, creating a positive pressure in the room, or exhaust to have a (somewhat) negative pressure? Also, where would that leave the cheap ducting fan to be placed, somewhere along the 20 feet of ducting, or as an active intake for the flowering room?

I placed a thermometer back where I vent the hot air into the basement currently, and there is not an increase in temperature, which makes me wonder if it is worth all of the effort in the first place considering I cannot even notice a difference in the basement? Before I create the holes in my flowering room, should I just perhaps return the new fan and shoot for an a/c unit before investing more money into a solution that will not work?

JohnCee said:

I was talking with a buddy of mine about my situation, and when I mentioned getting an air conditioner he looked at me like I was crazy and tried urging me to upgrade my fans. Would getting a 600+ CFM rated fan make a difference in the room temp when I cannot even get the room cooled down with the box fan in the door?

Click to expand...

Your buddy's an idiot. If you want to lower the temperature you're going to need an air conditioner. 600 cfm fan for a 4x4 tent is overkill to the max.

Picked up on one thing I didn't last time you posted. The lack of intake. You can run all the extraction in the world but without intake to keep up with it then the extraction fans are doing nothing but adding heat. They are overworked and cant possibly do the job they should. trying to extract air, even just into the basement, cant be done without that air been replaced, the fans will reach a certain level of negative pressure and that's about all. If you make the hole in your flower room, even passive you should see a difference. As you said with the door open your seeing 80degrees instead of high 80s, that says everything.

I also agree that some type of air exchange is important. I can only do this at night as the daytime temps for about 5 months out of the year are way too high and extremely raises the temps in my room. I run my exhaust through the cooler because it is the easiest source of forced air instead of running a separate fan attached to the top of the cooler. Your plants need a good supply of fresh/exchanged air.

I have also used the cooler in the winter months for odor control by installing several carbon filters in it instead of ice. Winter months I have to exchange air differently instead of directly from outside or my temps plummet very quickly.

These are the treads that I like to see, because there is a variety of opinions and options given without any discussion that there is only one way to accomplish something.

Greenhouse;save said:

He said he has no access to an outside vent.......

Click to expand...

If they can not be made (stealth reasons OP?) then you may have fell at the first hurdle. The money spent to light then work against that heat on top of potentially low levels of co2 may not make it worth while. Not trying to put you off but just keep it in mind. Fresh intake will guarantee you success. These other options in your situation may not, ofc I hope it does should you choose one.

Did I read correctly when u said u had a vent for a dryer.....?....if so then u would simply need to buy a Y flange to vent both at the same time. ...,,,.?