A/c question

Hello im wondering if i use a a/c unit in m y grow room does that eliminate the necessity of a air cooled hood? or should i use both?

Every situation is different. I personally dont have an AC unit or air cooled fixtures/reflectors in my primary garden (8' x 6' area with 3 lamps. 1000w and 2 400w) and my room stays between 70 and 78 degrees 24/7.

A little trial and error is the only way you are going to find out what works best for you and your garden. Start with one or the other and see what the results are then take it from there.