I was working out in my garage when this happened, it had been 50F outside when I went in the garage, I was sanding some woodworking for around 3-4 hours. At o

I was working out in my garage when this happened, it had been 50F outside when I went in the garage, I was sanding some woodworking for around 3-4 hours. At one point I turned on a propane heater on the next workbench over, but was still cold so I moved it over to my feet right next to me. Over about an hour, even with this I got cold and called it quits. My garage is drywalled, with insulation in the walls but none in the ceiling. I need to fix that.