I have a small portion of our unheated three car garage set up as my shop. I live in the Seattle area and we get some cold spells. The garage stays above freezing but it is not plesant working in the 40s F. I have a radiant heater that swivels back and forth which works well enough when it's not too cold. It can't keep up when it's in the 20s outside. I was thinking about barriering off the shop portion using a Zip Wall or something similar so I could use a heater and contain the heat in the area I'm working in instead of the whole garage. Zip wall puts up a plastic sheet from floor to ceiling and is primarily intended for dust containment. I was wondering if any of you have experience using it to keep in heat.