If you lived in Hawaii with plants in a room (not tent) with no AC, you would understand. Its 85 in my house right now, no lights windows open. My room gets hot.No why would that matter?
Sure if you constantly live in above 28C (82F) the saving a few BTU of extra heat might make some sense, but even then it's negligible. These drivers are 94% efficient. Do you really think adding 6% more heat is going to damage the plants?
Besides, it's convection heat.Which rises up and away from the plants towards the exhaust fan. So it wouldn't even reach them.