Cooling my room is impossible

A

Ant Grows Dank

Active Member
Well here's what I am doing, I have a 600 watter with a air cooled hood. The room is a 4x4 floor space with a slanted sealing from 3 feet to 6 feet highest point.

I am running c02 so the room is sealed, I am drawing air from my one bedroom which has ac to my other bedroom closet and then exhausting into the attic. This grow is on the second floor of the house which gets hot.

My temps have been around 94-97 which can't work for me or anyone in that matter.

Any ideas? willinf to spend money to fix the problem.

Thanks
 
A

Ant Grows Dank

Active Member
Forgot to mention I am using a 420CFM inline duct fan in a box for cooling, probably pulling threw 15 feet of ducting, the fan is blowing out cool air and alot but the room is still hot.
 
kayuman

kayuman

Member
Hey

Couple of more facts would be helpful, but based on what you have provided I'll take a starting stab at it.

I read that your venting the grow chamber with a 425 cfm inline, pulling (you are pulling air and not pushing right?) air in from another ac cooled bedroom.

How far is this duct run, how many elbows did you put into the vent line and is it accordian vent? (stretchy vinyl or aluminum duct). Answering yes to all of the above and include a vent run over 10' will turn your 425 cfm fan into less than 300 cfm.

You have a cool tube but no mention of what CFM of the fan that cools the cool tube and where does it exhaust too?

By any chance are one or two of your grom room walls also an outside house wall? You did indicate that the second floor in general gets hot. I suspect that thermal loading during the day is transmitting into the grow room.

Additionlly I suspect (imho...) from the comment of the slanted closet roof that although your home has a second floor it is not a "full" storey second floor and therefor the sloped ceiling is also your roof not an attic. If thats the case I again would suspect thermal loading transmitting through the roof.

If your walls and roof of the grow chamber are as I suspect than check for thermal loading by getting a thermometer with a high low memory and run your room for 24 hours. Check your high/low and this difference will be the day and night time running temperatures. If the difference is quite signifiant it's a thermal issues adding to your grow room temps.

Hope some this helps man, let us know more details as you get em

Kayuman:leaf::leaf::leaf:



If this is the case in all likelyhood you need more insulation
 
A

Ant Grows Dank

Active Member
kayuman said:
Hey

Couple of more facts would be helpful, but based on what you have provided I'll take a starting stab at it.

I read that your venting the grow chamber with a 425 cfm inline, pulling (you are pulling air and not pushing right?) air in from another ac cooled bedroom.

How far is this duct run, how many elbows did you put into the vent line and is it accordian vent? (stretchy vinyl or aluminum duct). Answering yes to all of the above and include a vent run over 10' will turn your 425 cfm fan into less than 300 cfm.

You have a cool tube but no mention of what CFM of the fan that cools the cool tube and where does it exhaust too?

By any chance are one or two of your grom room walls also an outside house wall? You did indicate that the second floor in general gets hot. I suspect that thermal loading during the day is transmitting into the grow room.

Additionlly I suspect (imho...) from the comment of the slanted closet roof that although your home has a second floor it is not a "full" storey second floor and therefor the sloped ceiling is also your roof not an attic. If thats the case I again would suspect thermal loading transmitting through the roof.

If your walls and roof of the grow chamber are as I suspect than check for thermal loading by getting a thermometer with a high low memory and run your room for 24 hours. Check your high/low and this difference will be the day and night time running temperatures. If the difference is quite signifiant it's a thermal issues adding to your grow room temps.

Hope some this helps man, let us know more details as you get em

Kayuman:leaf::leaf::leaf:



If this is the case in all likelyhood you need more insulation
Click to expand...
Yes i am pulling air not pushing.
There is 3 turns in my ducting. One coming out of the wall, one going into the closet, and one leaving the closet. I tried to make them so they are not 90 degree elbow. The duct run is no more than 15 feet.

The 425cfm fan is the one cooling my hood and exhausting into the attic from the bedroom.

None of the walls are outside wall of the house.

Here's a picture so you can kind of see the setup.


Thanks for all the help
 
kayuman

kayuman

Member
Ok so I jes wanna make sure I am reading this correctly.


You are using one fan, this one fan pulls ac air from a bedroom, through 3 bends, 15 ' of accordian duct, through the cool tube and finally exits into the attic space.

But, if I am reading this correctly, and maybe I'm missing it, but you have no seperate venting just for the grow chamber (this does not include the little circualtion fan that I see in the photo).

I see what looks like a scubber in the corner, whats feeding that?
 
A

Ant Grows Dank

Active Member
Yeah it's a sealed room I am running c02 so no intake outake. The scrubber just has to fans on top of it and sucks air in and filters it.

And yes everything you stated above is correct.

I also have a blizzard fan just blowing air around in the room no pictured.
 
4

420OldSchoolDJ420

New Member
sealed rooms are next to impossible to keep cool unless your ambient temps in the room your box is in is hella cool... Like 60f - 70F.. Even the most well ventilated cab in the world isnt going to get any cooler than about 5 degres above ambient temps... And a sealed cab is going to reach 10 degres above ambient and higher easily.
 
kayuman

kayuman

Member
Ant Grows Dank said:
Yeah it's a sealed room I am running c02 so no intake outake. The scrubber just has to fans on top of it and sucks air in and filters it.

And yes everything you stated above is correct.

I also have a blizzard fan just blowing air around in the room no pictured.
Click to expand...

Ahh there we are...... the bingo moment.

Your having a heat build up issue, your not cooling/venting the ROOM! e

Even though your cooling your light there is still lots of raidant heat form the top of the light (try and put your hand on it).

Anything electric adds heat to a room, even that little circ fan adds heat.

Scrubbing and returning air will not remove this heat, it will only continue to build.

Also your babies need fresh air, replenished every 5 minutes or so, it's like the law :mrgreen:. You'll jes end up killin your girls if you don't...

So you need another in line fan, like your 420 cfm-er to vent out the room and pull in fresh cool air and remove stale, hot air.

Get your air, temp and humidity under control first before you even muck with the C02 and do some (alot) more reading on C02, there are much, much better ways to inject C02, than sealing a room off.

I also run a 600W Scrog and I vent the lights with a 425 in-line and also vent the grow chamber with a 425 in-line on rheostats, and even than it's still a bit of strucggle to keep the heat down!

Hope that this helps...

Kayuman
 
A

Ant Grows Dank

Active Member
Yes I understand your point, But isn't sealing the room off the idea of a c02 sealed room? It replenishes the carbon dioxide in the room which the plants use to breathe. There for you don't need ventilation? If I add a intake/outtake the c02 will be sucked out and be wasted, correct?

Ventilation is used for fresh air and heating issues, but I am putting fresh air into the room via c02.

I am just having heating issues.

Also the hood to my light isn't very hot which is weird cause you would think the radiants of the light would be heating the room. Well I put insulation on top of the hood ( it's like sticky on one side and metal on the other side almost like dynamat ) and it seems to be keeping the heat in there better, but still heat problems.

Thanks for the advice
 
4

420OldSchoolDJ420

New Member
C02 is ONLY beneficial when ALL OTHER aspects of your grow are on point... Meaning you need to have every other aspect of your grow 100% dialed in before you will see ANY benefits from C02. Not really relevant but I thought it worth mentioning
 
kayuman

kayuman

Member
Ant Grows Dank said:
Yes I understand your point, But isn't sealing the room off the idea of a c02 sealed room? It replenishes the carbon dioxide in the room which the plants use to breathe. There for you don't need ventilation? If I add a intake/outtake the c02 will be sucked out and be wasted, correct?

Ventilation is used for fresh air and heating issues, but I am putting fresh air into the room via c02.

I am just having heating issues.

Also the hood to my light isn't very hot which is weird cause you would think the radiants of the light would be heating the room. Well I put insulation on top of the hood ( it's like sticky on one side and metal on the other side almost like dynamat ) and it seems to be keeping the heat in there better, but still heat problems.

Thanks for the advice
Click to expand...
I see what your saying, but,

A sealed room is a basic requirement for proper venting, enviro control and odor control, CO2 or not, sealing still needs to happen.

However I think it would help if you though of CO2 as an enviroment additive rather than try to use it as a mechanism of air replenshiment.

I understand C02 to be absorbed very rapidly by the plant, in other word C02 does not need a long time to linger with the plants to do it's thing, therefore venting can still happen with C02 additions and it all works.

I've been reading about some really nice C02 controllers that will either shut down your vent dampers or your vent fans, squirt some C02 and than fire up the venting again; the point being here is that the system still relies on venting.

Ultimately I think you will find that you'll need to vent your grow chamber to shed the heat accumulation and supply fresh cool air.

Kayuman
 
kayuman

kayuman

Member
Yeah 420OldSchoolDJ420 brings up a very good point. Get your temp, humidity,air, lighting and feeding down before you venture into the C02 realm.

This is obviously a new build, as you fire it up you will find all sorts of tweaks and adjustments will need to happen to get the basics levelled out.
 
A

Ant Grows Dank

Active Member
Alright yeah I think I am just going to vent it good, I have had to many problems with heat in the past.

So what would be the best way to vent this room out and keep it cool?
 
wonderblunder

wonderblunder

Well-Known Member
I would shorten the duct work and maybe get the ambient ttemp of the intake room down somehow depending on your location
 
KnowledgeSeeker

KnowledgeSeeker

Active Member
Ant Grows Dank said:
I am just having heating issues.

Also the hood to my light isn't very hot which is weird cause you would think the radiants of the light would be heating the room. Well I put insulation on top of the hood ( it's like sticky on one side and metal on the other side almost like dynamat ) and it seems to be keeping the heat in there better, but still heat problems.
Click to expand...
Have you measured the intake and exhaust temps for your light? Fairly certain that Al B. Fuct said that anything greater than a 6 degree difference means your light is heating up your space and you need to increase CFM or straighten out ducting.

I feel you on the CO2/heat battle (see my journal). You'd probably have to install an AC unit to keep it sealed (recirc window unit or dual hose portable NOT single hose portable) or vent the room. I made the mistake of purchasing a single hose and had to return it and get a dual hose.
 
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