Hi guys!
I posted a few weeks ago about my budgie Kiwi, who's approximately 10-11ish. He's doing so much better, as I spent 6-8 hours a day with him. I've fully budgie proofed my room, so he's a free range bird, who loves to sit on my computer and poop on my keyboard

However, now that summer has come into the picture. I was wondering what temperatures are acceptable for budgies. I've gotten mixed information online. I live in the Northeast, so the summers aren't TOO hot. For instance, right now it's 77 in my room. The high outside is 81. It won't get any higher than 81 in my room. Also, it's going to cool down tonight so this is about the hottest it will get. Is this okay? He's a really old bird and I want to make sure he's as comfortable as possible. He drinks a ton of water, wayyy more than my other birds, so I'm not worried about dehydration. He's never had any problems molting or anything, except for a cyst on his stomach he got once that went away on its own before the vet would treat it.
I turn the fan on at night (a stand fan facing me, away from his cage), but I don't have it on during the day because he's out and flying around. What's the hottest I should let my room get? (Idk if it makes a difference but it's also SUPER human ~70-90% humidity.)