Turn off the heater, problem solved.
So if u have the heaters off then what's the prob? You said you wanted a cold room. Sounds like u already got it right?
Oh im sorry I thought that sounded strange but maybe a small ceramic space heater? We had those in my building when I was in NYC cause it was so cold n nobody ever fix the heaters.
Put an electic blanket on the floor...
Try the garage.