You could sider setting up something for temp control, like this...
It's a rubbermade bin, I have an aquarium thermometer stuck on the side of it in the water and I use frozen 2 liter and smaller bottles of water to chill the water in the bin. Adding a fan blowing on the t-shirts will help lower the ferm temps even further...I can get my fermenters down into the low 60's in my loft this way.