Hi, we still have hanging garlic in our shed. A lot of it. Tonight's low is going to be 20 F. Anyone know how low can it go before it damages the bulbs? We have fans on it for air circulation. Tonight's cold not really an inversion if it's in the shed. Better or worse to leave them on? (also concerned about my kale and cabbage, but that's a different forum!)

Thanks for any and all help!