I have long considered putting in a cooling unit in my cold storage facility to keep things cold and dormant during freak spring weather that tends to warm up my facility. I keep cold weather natives such as larch, cedars and junipers mostly. In researching I have found that it is vastly cheaper to set up and cheaper to run, to have a cooling unit that can only chill down to 37 degrees or so. My question is whether 37 degrees would be sufficient to hold plants in dormancy?