It takes a long time to heat that much mass. Concrete walls may take a few days to warm up. I don't know if you have snakes in the rack yet but if you do you may find a cheap forced air heater may be a good temporary solution it will heat the air but not the room but a few min of warm air ever hour might be enough to kick it up a tad, until the oil heater has stabilized the room.
Reply With Quote