The Frost is on the Pun'kin

Hi everyone,
Some advice is what I need. With the downward shift in temps here in Minnesota, I need to know how other builders heat their workspace. My bench is in the garage, which occupies the basement part of our townhome. While connected to the house, the garage itself is unheated. Other than spend many $$$$$ to access the heating ducts from the garage, does anyone have a less costly suggestion. I mean we are possibly talking sub-freezing if the wind is blowing just right. Thanks in advance for your ideas.