temperature?

well its in my closet so if i added co2 it could help the fact that my closet is at like 82 degrees. i also am not in my room alot so it prolly doesnt have a very high co2 level at all. i dont wanna do the whole yeast sugar and water thing i want a more professional set up. if you know where i can get a co2 sensor and a way to add it to my area automated i would love to know.

Closet ? then you will be fine with the bottle my friend, tanks are used for rooms of like 20 square meter or above, with a good ventilation even the bottle isnt necesary. your plants will be just fine without the CO2 adding.

85 at maximum!!!!!!!!!!!!!!!!

you can still have somewhat of a professional homemade co2 set up...they have specific containers that you mix up your yeast and sugar in. your plants will be able to handle hotter climates with co2...and grow twice as fast

is active dry yeast the right yeast to used when mixed with sugar and water to make co2

Gibz it is actual brewer's yeast. But it is cumbersome to get the right temperature for either brewer's yeast or baker's yeast to bubble. Also, you have to change it about 2-3 times daily to have a CO2 ppm about 1,600. What I use is called excellofizz. I use about a half a puck in 50 mL of water in a container which supplies my area with around 1,600 ppm of CO2 plus the amount of CO2 i am dragging in from the outside boosting it to about 2,000 to 2,200 ppm of CO2 daily. Excellofizz does not generate heat like CO2 generators do. It also has a nice eucalyptus smell to it and also deters spider mites. It is pricy though but in my mind a good investment.

Answer to the original question. Optimal temperature for growth of cannabis ranges from 75-80. Temperatures reaching 90 can cause stunting or complete growth stop. Temperatures below 70 invites mold and mildew.