Morning Dutty. All I've used is gorilla tents and led. You will still have deal with some heat. I think you said 2 p600. You can expect to have to deal with 600 watts of heat and in a 5x5 with no exhaust you still got about 2400 btu/hr staying in the tent. I'm running 1350 watts in a 4x4 and 900 watts in a 3x3. I exhaust into a 13x10 room. I had to add a ductless and run it at 70 degrees to keep the tents at 80 degrees with humidity between 50-60%. Hope that helps.