I found the same thing went from a smaller tent to my new 8x4 and with adding an addition of lights temp went up… but AC fan went up one notch and evened it all out… those ac Infinity fans can move serious air! Just dial it in man took me three days or so to know once I set the new one up. Just plan to run the tent without anything in it until you think you got it right… adding plants will bump humidity so don’t have to worry about that in the empty tent test… no plants 8x4 was at 32-35. Basment is at 50 all times now with plants in it reaches the 60s and 70s if I let the run off stand in the drip trays