With temps like that, you don't need a/c..I run my lights at night to keep cooler day temps. When I get to harvest time, I add frozen gallon containers to the tent and drop my temps to about 65°f...I freeze some nutes into ice cubes and water too and feed/water at lights off. I drop the soil temps down to around 50-55°f..I max darktime to 16 hrs to mimic winter...only 8 hrs light. I add co2 bags (sometimes, when the buds need to be thickened)...this maximizes my terpene development. I also add IR/UV bulb 2 hrs for last 2 weeks..Here is a pic of my GDP...natural light...