Central air fluctuation detrimental?

I have a 5x9 in an enclosed room. Temps were soaring. I tapped into my central air ducting and now have a 6inch duct going directly into my grow tent. I have an ac infinty 6inch fan doing the exhaust out into another room. The central air is set at 69 in the house. My temps fluctuate(due to air kicking on and off every 15 or 20 minutes. Between 76 and 82(in the tent). Will those short spikes hurt? Will 85 for 2-3 minutes intermittenly hurt?

Should not be too big of an issue for such short periods. And you are with in limits, barely but still OK. You can ask multiple questions in a post, I could have answered it on the other page lol.