I try to keep mine at 72 but have been known to go down to 70 and even 68 in the dog days of August.

My late DH used to love it cold....so I got accustomed to it being about 65 degrees year round inside. His mother hated the cold and whenever he'd had enough of her visits he'd go turn down the AC to about 60 degrees! It worked every time!! She'd say "I don't know how you kids stand it so cold in here." We knew she was on her way out when she'd day that!!