Garage Heating

+1 on the garagejournal site. I run a HotDawg heater too. You only need one and they come in various sizes. IIRC mine is a 30,000 btu for a 24x26 with 11 foot ceilings and R20/40 insulation (it gets cold here). The majority of the cost (over 50%) was running the gas line to the garage! I know some have crunched the numbers and used a propane tank installed outside instead of getting a gas line installed. There is a thread on GJ on this.

ps without a vent stack the humidity level skyrockets in the garage. I found this out when using a 55,000 btu propane heater to heat the garage while I finished the walls.