[gary678*]

I should have added more details to my earlier post (#14). My garage is detached from house, R30 in the ceiling, R15 in walls, concrete floor. I only use the portable kerosene heater when working in the garage, turning it on 15-20 minutes before working, turning it off upon exit. In the winter I store freeze prone items in my house basement (basically paints). This works efficiently and economically in New York's Hudson Valley.