Need help with Dry ice

So my flowering room size is 8x6x7 feet and I want to introduce dry ice to my flowering room. Can someone please tell me how much I'm going to need per day? I'm really scared to try it, but I know a lot of people on here have used it before and have gotten some really good results.

2lbs of dry ice will raise a 10x10 room to about 2000ppm for a 24 hour period.

Use a cooler and poke some holes in the top. the stuff melts pretty fast.

of course, room temp plays a big part too. if possible, place the cooler outside the room/tent, and suck the CO2 in.

Where I live the temps tend to raise pretty high during the summer I plan on using an ac to cool my place down. What would be the ideal temp to have the room while using dry ice?