I have ultimate radiant tube heaters in both of my IBA's. I am open 24 x 7 all year. Even below zero weather in the winter when they are rowed up all day washing salt off of their vehicles I have no problems. The enter & exit
doors are opening/closing about every 7 minutes and no problems. No heat in the IBA slab inside the bay. Outside slab is heated to help keep the ice buildup down. The only thing I would like to change is the time that the exit
doors stay open after the vehicle leaves - when a car is waiting both
doors are open at that point and the wind blows a lot of my heat away. Still no freezing issues but it would save on propane if I could retain more of the heat.