Quote Originally Posted by asintx
Air conditioning set to 76, but the thermostat is outside of the room. Any cooler than that would make the rest of the top floor too cold for comfort.
You also can open the vent in the room wide open and close down and/or shut the vents in the rest of the house to try to balance it out.

Since heat rises and the earth stays cool, top floor rooms are harder to cool than bottom floors and a basement is easiest to keep cool, if you've got a lower room to move it to.

imp:
Sinsemilla Jones Reviewed by Sinsemilla Jones on . Heat Hi, I have just finished setting up my grow room, complete with lighting. I began monitoring temperatures last night. The room stays a pretty constant 75 (50% humid.) unlit, but once the light was on a couple of hours, it raised to 80. I don't know what it will be like once its on 18 hours! Any suggestions to lower the heat that I haven't thought of? Background: 10 X 10 X 8 carpeted, top floor spare bedroom. 400W MH light Rating: 5