Temprature problems

[Akadan77]

hi all, Fairly Newby here, really struggling to keep the temp down in my tent, i got a 2400 x 1200 tent and im about to start up again running 3 lights (3 bubblers) but before i start im having a play around trying to get the enviroment sorted which im finding difficult.

At the minute its really hot here in the uk and the temp of the room its in, is 26/27 degrees, iv got a 10inch fan reduced do to a 8” pipe for the outtake and i used to have a 8 inch intake fan bringing in the fresh air from Outside, this air is no longer fresh so on the last crop i completed i purchsed an air con unit, this is sat above in the loft, i have taped a pipe to the front so it blows the cold air into the tent, this is not reliable however, obviously there not designed to work like this, some days it would be working other days it would not, at all and my temps were all over the place! Im out of ideas really. Cant see how else i can get the temp down when the lights are offeven st night the room temp is sitting at 24 degrees all night

With an Empty tent, i switched the outake fan on today to see if the room tempreture dropped at all, and if anything it actually rose (possibily due to temp outside generally getting warmer) but eitehr way the outake alone doesnt help with tempreture at all, is this normal??

Thanks guys

 

[Kingrow1]

1.) Thermometer placement is key to reading true air temps, it must be shaded from all light direct or otherwise. Many dont have a true air temp reading and conversly assume its hot.

2.) Air inside a vented/extracted tent will be more inline with the air temps of the room the tent is in. If you must cool then cool the room or house not the tent. The tent will lower as the room temls lower.

3,) I am in the Uk, 33°c down the road the other week, before i switch my hps on the air inside reads 27°c. Some here question how i manage to grow but if you can grow healthy plants then they will take hotter.

Growing indoors aint easy but a skill thats going to take time

 

[Lucky Luke]

The English and their "hot" weather.

Friend of mine just got back from N London. She got sick of her family and everybody saying how hot it was. She found it amusing at first and then annoying. She said it was only 31c. She got back and can understand why we call em whinging Poms. She was born and grew up in London and calls herself an aussie, just like my farther in law.

anyways..ur in veg..plant em.

 

[Akadan77]

The English and their "hot" weather.

Friend of mine just got back from N London. She got sick of her family and everybody saying how hot it was. She found it amusing at first and then annoying. She said it was only 31c. She got back and can understand why we call em whinging Poms. She was born and grew up in London and calls herself an aussie, just like my farther in law.

anyways..ur in veg..plant em.

How very helpfull lol, will do

 

[Akadan77]

Thanks mate, interesting stuff, Well i hang my thermometer on a stick down from the light so its in the canopy area, i do this on the light furtherst away from my intake. so yeah that will be under direct sunligght with lights on. (See photo iv just screen shotted my live camara feed to show you) excuse night vision.

so where do you guys reccomend placing themometera in the tent at then?

When lights are off is 25/27 degrees an ok temp for the plants? I guess i could have aircon cooling the box room the tents in and have just an intake fan going to the tent bringing in outside air, but surely that will just be hot air and bring the temp up.

 

[Lucky Luke]

Just plant em, Higher temps in veg is not a problem. Remember were these plants come from..
In flower lower temps help but its doable at higher temps to. If you click on this number -> #141 it will show you plants that had a rough start and saw low to mids 30c's in flower.
If there not good enough for you, invest in AC for flower.

 

[Kingrow1]

Thanks mate, interesting stuff, Well i hang my thermometer on a stick down from the light so its in the canopy area, i do this on the light furtherst away from my intake. so yeah that will be under direct sunligght with lights on. (See photo iv just screen shotted my live camara feed to show you) excuse night vision.

so where do you guys reccomend placing themometera in the tent at then?

When lights are off is 25/27 degrees an ok temp for the plants? I guess i could have aircon cooling the box room the tents in and have just an intake fan going to the tent bringing in outside air, but surely that will just be hot air and bring the temp up.

Your thermometer is placed wrong, move away from light and shade, mainly side of tent but some place in lots of other locations. Remember its air temps you want and nothing else.

In weather statiins this is how air temps are read and thermometers placed, simple science but work at it now your aware, peeps here often use the words 'ambient temps', it describes what ive explained.

 

[Kingrow1]

The English and their "hot" weather.

Friend of mine just got back from N London. She got sick of her family and everybody saying how hot it was. She found it amusing at first and then annoying. She said it was only 31c. She got back and can understand why we call em whinging Poms. She was born and grew up in London and calls herself an aussie, just like my farther in law.

anyways..ur in veg..plant em.

So plus thirty celcius is not hot? Hottest place in the world averages out at 36celcius for the year and at 40 kids oldies and animals start to suffer/die as whats happening in Japan.

Ive lived half my life in hot countries, aint no competition and dosent show you know how to place a thermometer.

Us whinging Poms would love you backward criminals to come join us in our dissaproval sometime

 

[MichiganMedGrower]

I disagree. I hang sensors over the canopy right under the center of the lamps and away from the lights as well. I want to see how hot and humid the canopy is and the ambient room temp.

White rather than black remote sensors so not exaggerate the temp under the lights.

You can see the white plastic wire and sensor housing hanging above the plants.

 

[Lucky Luke]

So plus thirty celcius is not hot? Hottest place in the world averages out at 36celcius for the year and at 40 kids oldies and animals start to suffer/die as whats happening in Japan.

Ive lived half my life in hot countries, aint no competition and dosent show you know how to place a thermometer.

Us whinging Poms would love you backward criminals to come join us in our dissaproval sometime

low 30c ? no that's not hot. High 30c and 40 plus is hot.

Its "winter" in Darwin atm and its 29 to 32c this week. Lows of 20c's over night

Western Sydney see's weeks of very high 30c and 40c. Sydney saw a 47 last summer. My sons a roof tiller...

People start to suffer and die they are not acclimatized and don't drink enough water. Like locking a dog in a hot car our plants need airflow in a warm grow room.

And we join you in our mutual disrespect for the American govt and their weirdly "legalized", legalized cannabis, that's not really legal...and their war mongering and postulating on the world stage.

I also hang my thermometer at canopy level

 

[Kingrow1]

I disagree. I hang sensors over the canopy right under the center of the lamps and away from the lights as well. I want to see how hot and humid the canopy is and the ambient room temp.

White rather than black remote sensors so not exaggerate the temp under the lights.

You can see the white plastic wire and sensor housing hanging above the plants.

View attachment 4170412

I give exacting reason and placement of thermometer for the reading of 'only' air temps, any deviation from this will not give accurate readings and is a pointless reading.

All info is available through google and met office or meterology centre, anything else is inaccurate broscience imo

 

[Kingrow1]

low 30c ? no that's not hot. High 30c and 40 plus is hot.

Its "winter" in Darwin atm and its 29 to 32c this week. Lows of 20c's over night

Western Sydney see's weeks of very high 30c and 40c. Sydney saw a 47 last summer. My sons a roof tiller...

People start to suffer and die they are not acclimatized and don't drink enough water. Like locking a dog in a hot car our plants need airflow in a warm grow room.

And we join you in our mutual disrespect for the American govt and their weirdly "legalized", legalized cannabis, that's not really legal...and their war mongering and postulating on the world stage.

I also hang my thermometer at canopy level

I have tried to read air temp at canopy level but it was never accurate. I feel you have some to learn here about reading a true air temp and that some things may become a whole lot clearer.

Australia is generally too hot to indoor grow without a cooler or cooled area, to my knowledge weed dosent handle your summers very well so indoors is flawed as well. Most aussie growers seem to have a cool basement or cool their house allready.

No leds will make up for air temps where weed wouldnt survive well, i teach ambients not some snakeoil mythical shortcut to growing.

 

[Kingrow1]

To know how youve got reasonably accurate air temps in a small tent with 400cfm inline strapped to the corner... just place the thermometer outside the tent and when your insides are a couple degrees of your outsides your in the ballpark.

I made that up but its pretty close to reality

 

[MichiganMedGrower]

I give exacting reason and placement of thermometer for the reading of 'only' air temps, any deviation from this will not give accurate readings and is a pointless reading.

All info is available through google and met office or meterology centre, anything else is inaccurate broscience imo

But the hotter temps the leaves are dealing with is as important as ambient temp. I monitor both from various points too. And the relative humidity.

 

[Kingrow1]

But the hotter temps the leaves are dealing with is as important as ambient temp. I monitor both from various points too. And the relative humidity.

Dude you have no idea really,

Why is it that you guys cite so much science but yet you come up so wrong on simple little science points.

Measure the canopy temps all you want, irrelevant as were only interested in air temps and that cant be read if light radiation strikes the bulb.

You go believe Michigan University, there are many here who take my word over that place and know how to grow a damn site better. Ever noticed that the guys that bring you the weather reports dont have their thermometer in open light facing upwards towards the sun? Why have you......

Theres science and then theres misguided bro stuff here where you think that your at the pinnacle but really kingrow says your not, you may argue but eventually your wrong and it shows

 

[MichiganMedGrower]

Dude you have no idea really,

Why is it that you guys cite so much science but yet you come up so wrong on simple little science points.

Measure the canopy temps all you want, irrelevant as were only interested in air temps and that cant be read if light radiation strikes the bulb.

You go believe Michigan University, there are many here who take my word over that place and know how to grow a damn site better. Ever noticed that the guys that bring you the weather reports dont have their thermometer in open light facing upwards towards the sun? Why have you......

Theres science and then theres misguided bro stuff here where you think that your at the pinnacle but really kingrow says your not, you may argue but eventually your wrong and it shows

Lol.

I never mentioned any university study on temp sensor placement. You talk in silly circles.

I will say the U of M is one of the most respected schools of agriculture in one of the largest food producing states.

You write things like “I made that up but it’s pretty close to reality.”

Those white plastic encased sensors give stable and accurate air temps under the lamp. The black ones heat up more.

The display face of the main unit however has glare and shows hotter temps in direct light. They are hung over and away from the lamp and show ambient temps from a few places.

You can clearly see the effects of heat stress on the upper leaves in my room when those hanging sensors show above 79 degrees.

Or if the ambient stays above 80 for a while the plants start showing stress. And the whole room starts to feel hot.

Only way to be more accurate is a laser ir thermometer and actually measure leaf temperature.

But it’s not necessary. What I am doing is working fine. Doesn’t matter if it’s a few degrees off. Most meters are. What matters is consistency and happy plants.

Which I have clearly shown.


Do you ever show your garden? Anyone can read blogs and make speeches.