How to heat

electricity will break your back , money wise . Wood will break your back , labor wise . Unless you get your wood for nothing there is no advantage to it . If your budget allows I would go for a Modine . Safe , clean , economical and warm . Unless you can keep the heat on the cold will saturate your car, tools and equipment and make it even more difficult to heat . My garage gets so cold that I can't hold tools in my gloved hand .