my grow room

first time grower over here and like opinions got large grow tent with 424 cfm high velocity. Fan with 6" duct tubes on top extracting heat from 400 watt hps light temp with light on is 70 Fahrenheit but out side tent is hot due to its in acttic to hide scent of buds bout 90 in hot days up in attic i think off adding new fan in side tent to get ride of ac unit also thinking get digital thermostat. With humidity temp. Included