Garage heat

lotta yall suggesting some type of wood burning heat, he in chitcago, where he sposed to find fire wood?????? probably cost to much but a gas fired boiler hooked to an in floor piping system works great in type environment your in! might still be plausible using right type heat exchanger... look into wel-mcclain boilers eden nc for better details....

And just what are you going to use for fuel? Thanks for spending the OP's money. "I'd assume" that if he has an un-insulated garage, he likely doesn't want to chisel up the slab to bury piping. Plus you have to protect a boiler from freezing, which means "running it at all times" in freezing weather. He already mentioned that getting gas to the garage would be expensive...................