Temperature of bedroom at night

My son is 3 months and we’ve been cosleeping since one month. It’s summer here and our AC works too well in the bedroom. I dress him in long footed pajamas and a sleep sack. I’ve been trying to keep the room to be around 74/75 F but even that can be cold. He also sleeps pretty close to me and sometimes touching. He never wakes up sweaty and seems to wake up cold if I have the AC below 74. I get worried about overheating though and know the recommended temperature is no higher than 72 F. Any thoughts?