C02 is heavier then air so it sinks to the ground right?

If thats the case could i open one of the vents on my tentwhile having co2 pumped in?

My room was 85 closed before adding c02 and i thought itd be perfect for adding co2. But i failed to relize c02 raises temps so now im at 90 while tent closedand co2 on.
Is it okay if i keep my top vent open while c02 is on? Or will i be wasting it?

Also no co2 meter. Kinda tight ob money trying to buy a house at the moment. So i just run it for 15 min off for 15. And its barely on. The lil ball is at 2 on my regulator.

a controller would be ideal but if money is tight that's out.

CO2 is denser than air so it will gather along the bottom of the grow. Just use a fan to push it up toward the plants. Using CO2, u can get away with slightly higher temps up to 90. Many growers who have a sealed grow space use CO2 supplementation and good circulation with great success. 1500 ppms is desirable with CO2 systems. U can vent ur space if u have the option but I would turn the CO2 off when venting so u don't waste it. I'd get the CO2 monitor to play it safe...too much will be detrimental to the plant's growth.

Controller is out of the question for now. I had poor circulation so i added co2 so i could close my tent up. And the only way i could vent is if i open the duct hole manually every other 15 min.
I have a cool tube and i have duckting pulling cold room air from the bottom and exhuasting out the top of tent.
Could i take the one thats pulling the air in the cool tubeoff so its sucking air out the tent instead of the actuall room. And just have it run 15 on while the co2 is on its 15 min off cycle. I can take pics when i get homw today if thatll help

if you're running co2 you should have the cooltube ducted on a loop outside the tent, have it pulling and exhausting air from outside the tent .

Thata what i have.
I caby belive im gpnna say this but i turned my fan up all the way amd its fixed staying at a cool 85