c02 and a hot room

my room is 5feet by 7feet and i have it pretty dialed in and i like my yeilds but i feel that i could get more with co2 now i have 2 1000 watts in cool tube which keeps my temps just in check but i also exhuast my room with a 440 cfm can fan which is run 24-7 but i can turnit off for about an hour at a time before it gets too hot. now my question is can i run co2 for that hour or 45 mins then exhuast or is it just a waste not to keep the co2 at 1500 ppm the whole time. just wondering what others do if they run co2 i dont want to use a dehumidifer and air conditioner because my bill is allready big enough

thanks for your time and responses

Ideally you would like to keep the level at 1500 ppm. What is the temp when you do not exhaust?

ive never let it get above 95 so i dont know how high it would get im pretty crazy when it comes to my environment so i couldnt let it max out. i was thinking a larger fan on my lights like an upgrade from the 250cfm to a 6inch high output 465cfm might keep my temps in check longer.

as a side note i was wondering how well a small carbon filter acting as a scrubber would work to keep the smell from leaking out i know my big ass filter for exhaust works very well no smell outside at all so just a little one to clean the air while to exhaust is off

thanks for the reply