When i bought my house my building inpector told me that the furnace in my detached garage was junk, which the seller confirmed, so i took money off for that. Now here i am with a two-car detached garage in the winter with no heat at all. i definitely want to get this problem rectified this summer sometime, but am undecided on what kind of heat to get. Should i get your typical furnace, or a box-type that suspends from the ceiling? What do the rest of you have in your detached garage? Remember i already have the gas line run so this shouldn't be too expensive.