Currently my tent is staying from 72 to 80 degrees. What is ideal temp?
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That works for me hell to tell truth my auto loves it at 77-81 really grows at that temp
At lights out about 70 nightly
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@Miagrace16 . 72-78F is ideal …after 80 F they’ll slow down. At 85F they’ll stop growing unless your giving CO2 to them then. You can take them over 85F if you supply the correct amount of co2 …But if in hydro , youll want to pay attention to the H2o temps . 60F-- 70F max .Hammer
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What happens if they get below 70 degrees?
they will slow down a lot,i maintain my room at 72-75f day time and 65-67 f nite time .Hammer
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Where does your humidity run i stay between
33-40 the whole grow. Temp and humidity go hand in hand maybe thats why my plants do so well at 77-81 but this auto is number four for my grows last three were all non-auto flowering plants and they did very good but i want better every grow so thats why i ask
Thanks happy growing
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My autos have been growing in an uncontrollable environment and it stays around 85-90° with about the same matching humidity. It sucks. Plants grew but are definitely not as tal and buds look thin and long instead of fat and juicy
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Yeah i know how my grow space works for non-autos but as we know autos can be very particular
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@Brian091180 To whom were you asking about RH ?? If me , 52-57% at nite and day is 67%–70% . Hammer
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@4play . if you can reduce heat you will automatically reduce RH % … And at elevated RH means elevated risk of molds and mildews . Hammer This is the reason i run cooler as my buds fatten …one now is Rainbow kush and has a cola 5 inches thick …don’t want that black mold on that .
. I also lower RH at night more than the day …Hammer
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I hate to say it, but I completely disagree with you @hammer.
I’ve never used CO2 and my plants grow at 85F with absolutely no problems at all. You don’t “need” CO2 for it to grow.
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@ktreez420 . whater you burning …?? OR Drinking ?? ALL PLANTS need co2 to grow … and by changing your air out as in venting you get adequate co2 naturally… But if you boost co2 you can push it 85-100 F … and you say 85 is just fine , then you should GO Back and reread the grow modules …this time with 
it may help …and didn’t you have brown algae probs …could be related to those high of temps ?? . And at those temps they slow down and slow up take of PPM but increase water up take …Just cause their drinking ,Don’t mean their eating the nutes … and Miagrace16 's Thread is called What is ideal temperature in a grow tent … NOT How Hot Can I get away with Growing A Particular STRAIN …LOL … as A LAB Member And a giver of Notable Advice .Please follow the Directives in THE LAB ,Of Those That Designed It, Built IT , and Wrote it On How to Properly Grow MJ … they wrote it to help us maximize our ability’s . then we take that knowledge and teach others, Here That Way . it leads to less confusion … …
Hammer
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Thank you for all of your information . When you say changing your air out that is one thing I am concerned about . I have an exhaust fan that sucks hot air out of the tent through a carbon filter at the top. And a fan on the inside blowing to keep some air moving and support strong plants . But I don’t have a fan pulling air in from the outside . Is this something that I should do? I have 4 vents on the bottom of the tent that measure 2 ft long X 6 inches wide . The dealer I bought grow tent from said my exhaust fan that is pulling air out of tent will also be pulling fresh air in through those vents at the bottom. Would this be adequate fresh air ? Thank you
Sounds like we have the same kind of tent
…and all I have is my 4" inline fan with carbon filter… No intake fan… Just one blowing around inside… Just make sure when the exhaust fan is on make sure the vents are open… Otherwise you’re creating a vacuum and the fan will blow cause it’s working to hard to pull air…
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@Miagrace16 It’s not a problem .as long as your room temp, your pulling from is less then 75-80F . your tent is set to maximize ventilation .cool in the bottom and out from the top where it’s the hottest , also it will create a small vacuum . that’s intentional … its to help prevent the escape of odors … and yes that should be adequate air for normal venting and heat control …what type of liteing did you purchase or use . air cooled or no ? . Hammer
Ok perfect thank you. I bought a Mars hydro 192 LED
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Ok thank you. I always keep my vents open. Is this a good or bad idea?
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Open . Hammer 
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I wish i had bought that light but i when the build a room as i go why ive got 2 MarsHydro 600 and im very happy with them youll love that light
What height do you run your Mars hydros?