Heater for a garage? I would like counsel on getting a heater for my garage. ...

I would like counsel on getting a heater for my garage. It is full-size 23x 24 x 19 feet giant. I just have a small loft built where I hold my tools and I want to heat it up for a moment when there. It is uninsultated. I do not want to spend a alot of money or run up lofty energy cost. Just some bake in a small nouns so I won't be quite so cold. Any warning?
Cement Board??
Answers:    I would use a small electic heater, give or take a few 1,500 watts near where on earth you work.
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I worked for an LP gas co and we used to put in heaters call L.B.White heaters you don't use much gas at all, near not that big and they hang above your organizer. They where made for hog house's but work virtuous for your shop!