Got an oversized central unit on the house, had the ducts cleaned 1 week before start, HEPA filtered down, 4 inch duct straight into the tents. No temp problems been avg74-85 with tent closed(on Veg tent). Once flower begins have a 200cfm vortex fan on carbon filter so will draw even after unit kicks at night so will stabilize temp more so then. I don't see heat being an issue even though i've heard alot of ppl say it is in tents. But have had the 400WHPS tent online for 2 days just to test temps so far with no can fan, just 4 inch intake from Central unit had hasn't hit 87 yet. Thats just venting out the bottom side flaps and 2 open top 4" vent ports. I'm not impressed with the internal material. In 3 weeks it already shows "Sun fade" from the lonely T5. But for a fuck this i'll be damned if it's dry for the holidays, last ditch effort for a non schwag new years, this is what i threw up on a weeks notice. BTW thats 2 tents, T5, 14x16 carbon filter, 200cfm Vortex, 400hps with Eye EN bulb, old shop fan, nutes, heating pad fer clones,10 beans. light hangers n all. Easily do-able over a month period of budget. Above pics from top to bottom chronological up to day27.