I run my lights at night. It keeps temps cool and I can open up the door to air it out before I go to bed and when I wake up. 8pm-8am is how I do it, it also works out well for maitinance since I only work on it when everyone is asleep.

I'm not sure about his lifestyle but if he could open up the closet just once a day around 1/2-3/4 the way through the cycle, he could let out alot of hot air and let in alot of cool air. I used to drop temps in my closet from 84-75 by positioning a fan to blow cool outside air into the top of my closet for 5 minutes. All that work cooling down my closet so I could let my sunflowers have a headstart growing during winter, only to have ALL my sunflower contract some kind of disease and die within 3 days of eachother. A total of 10 plants, all seperate pots and such, ALL died within 3 days of eachother and 5 days after showing symptoms... anyways...