Temperature help Needed!!, New room, Need you advice

I have my new room setup 3X3X8 with air cooled 1000watt bulb dimmed to 600watts, 6" duct and 220 cfm fan cooling that.

I have a water timer running cold water through a 50 foot hose thats coils in the rez and then into a drain that works as a coil cooling system. The rez cooler runs 2min on every 2 hours and keeps the rez at as low as 55 and as high as 67, but between 59 -67 during the light cycle is that ok or Is that to much fluctuation?

The room is running from around 84 - 92 during the day and Nights about 75 - 78 I've been told this is to hot?? Is that true?

I plan to run C02 and am expecting it to give a bit of a cooling to the room but I have not sprayed the room to test the tempurature drop.

I also have 1 fan on the floor blowing the cool air up from around the res to help and that dropped the room temp down from thew high 90's.

I think thats it.

My hangup is, if I vent my C02 goes out with the hot air so im looking for guidance on this, Thanks in Advance!!!

Cooler res temps are always better than the warmer side. I don't think the fluctuation will have too much ill effect. 90 is too hot. It is a big job to properly set up and run a co2 enriched environment. I can give you many details but it will cost you many dollars to get it going the right way.