Highest temps you've ever grown at?

Right now my little ones are experiencing temps in the 85-95 range. But that's just cause my A/C is out. If ya want anything decent for your efforts you NEED to get your temps back down to at least the upper to mid 70's. I believe 72 is just about ideal.

Apparently THC and cannibinoids can degrade at > 90c, so you really don't want to keep the temps that high for extended periods of time if you can help it at all. Any chance you can put an aircon in?

Does that mean it's okay for a higher veg temp?

Its a closet grow so no way my AC is goin in there. Usually I keep my door open and my AC on in my room to keep the temp a bit lower.


All I can do now is experiment with fan positioning unless someone has a better idea.

Wait a moment, I read that cannabis can withstand higher temps if their are higher concentrated levels of CO2.


Maybe some yeast/water in a plastic bottle with my aquarium tubing?

Qman that is an amazing contraption I would love to implement but the problem for me is that 1. my AC is on the other side of my bedroom, 2. I am quite sensitive to any heat over 85. If I were to use my Ac for my grow op I wouldn't be able to sleep. Unless of course I slept in my growroom.:rock

Is it possible to maybe rig up my AC so that only a third or maybe a half of the air flow is being directed into my closet?

And even then I would have air tubing going around my walls. I already have an excess of extension chords as it is.

I do have a window much closer to my closet but I cant put my Ac in it cause it's right above my bed and me and my girlfriend use it to blow our hits out of. That's about 90% of our day right there.

Any ideas of how I can adapt to this?

GigZ-16 said:

Is it possible to maybe rig up my AC so that only a third or maybe a half of the air flow is being directed into my closet?

And even then I would have air tubing going around my walls. I already have an excess of extension chords as it is.


Any ideas of how I can adapt to this?

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Well, the only thing I can say is you can make something work if you are creative AND you are going to have to make sacrifices in your room/space if you want to get control of your climate

Maybe you could get a window A/C and utilize that somehow? so you don't have ducting running all over

I know you blow your hits out the window but, like I said if your crafty you can think of something, and again you may have to sacrifice something to have a successful grow.

IMO I would do everything I could to get those temps down

Here hit this and ponder (I do this very well) :)

:passingjoint:

GigZ-16 said:

I do have a window much closer to my closet but I cant put my Ac in it cause it's right above my bed and me and my girlfriend use it to blow our hits out of. That's about 90% of our day right there.

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I have a couple suggestions about how to hide the smoke besides blowing it out the window.

When I was in high school I would smoke in my room by taking a soda bottle, cutting off the bottom and taping a big trash sack to it. I would then only smoke bowls by putting in a pinch of weed at a time(just enough for you to smoke the whole bowl, without any side stream smoke.) Then exhale into the bottle and put the cap back on. all smoke goes directly from bowl, to lungs, to trash sack. No smoke gets into air.

Or take an empty toilet paper roll and stuff it with fabric softener. Blow your smoke through that and it filters the smoke, when it comes out it smells like laundry.

Hope that helps you make a choice about your set up. :)

Edit : Or you could just move your bed to the other window? Most of the time the simplest solution is the best solution.

FastForward said:

Apparently THC and cannibinoids can degrade at > 90c, so you really don't want to keep the temps that high for extended periods of time if you can help it at all. Any chance you can put an aircon in?

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Thanks for that fact, never knew it. All I have read is that the plant growth slows after around 85 (not sure about co2 enriched air) so I think anything under that is fine.

99 degrees for 3 days phewwwww.... those 3 days were really hectic lol now its at 65 :)

Had some random genetics outdoor in a greenhouse this year back in july, still vegging. To make a long story short i didn't know much about greenhouse construction, didn't have any air flow, and the plants did a day at about 140 degrees, 75% humidity. They were lookin pretty worked over at the end of the day. Modified the greenhouse in a hurry that night. With some lovin, though, the plants came back. They yielded OK, the quality was pretty good. I know in Afghanistan and other parts of the middle east the temps. can approach 130, maybe 140 degrees in the summer. If you posess landrace genetics from an area like this, one might be able to throw a lot of heat at them with a decent result. And yes, heat does help co2 intake....up to about 85 degrees. be careful though indoors because this may mean you have raise your lights since the canopy is at a hotter temp, best not to scorch your gals.

High Temp

Vegging can be anywhere from 72 - 85f with a humidity level of around 60% and when flowering cannabis's intake of CO2 is highest at temps of 85 - 95 f but safe levels indoors can be between 85 - 88f.

I have a dual open and closed system on my flowering area, as my veg is on a seperate venting system. Just turn off your exhaust when you are burning the CO2 but do it for about 3 - 4 hours daily should be sufficient during weeks 3 -6. Just be around for that time and check every ten minutes or so if you can, good luck!

I hate to think of this. Out door 120F peak. 4 days stright 115F dropping 90F at 3AM. Talk about just STUPID TEMPS and you geuss it NO AC, CO2, or DEHUMIDIFIER !!!! Then pulling 1.5p out of 1000W

Just Blowing in this hot air... Did i for get to say the heater and water heater is on the other side of the walls intake too.... With the cement area where the heater and water heater, Kinda kept the temps down a little. Then Grow room ran up 89F with a 6F 2IN floor to sealing.

All i can say is, Let this 21F stay around for ever!, -snow ;)

Amen to that brother! I was hating life when it was hotter than hell but now since its cold our indoor grows can utilize a/c much less or even not at all (in my case).

Highest temps I grew in was 90 indoors. Anything after that and they got toasted. Strive for good temps and you will be happy all around.