I keep my house cool too, but cannot run without an air cooled hood. Right now I have a small 32" x 32" tent, a 400W mh, and 4" exhaust fan in a room that stays about 60-65. I tried running for awhile without the glass in the hood, but the temps got close to 90. Put the glass in and connect ducting to it and it is running about 70. While some may be able to run without an air cooled hood, most of us find that we need them.