garage heating

as the fellow said the heater has to be a min. 2 feet off the ground,,that seems to be code almost everywhere, so an old house furnace dos not meet code,or insurance requirements. propane heaters can be used here with out an outside vent but not hooked up permanent and only for temperary heat during construction. They will cause a headache but as a rule not kill you, but hey,,,,always exeptions to the rule,right. I know the propane rules because I was the shop foreman at a huge rental shop for 9 years.