Ciao Petea, This is just suggestion, I don't know how it would work for you. We also live in Pennsylvania, Central Pa, yes, it is very cold. if tree is big and in ground, you would have to bury it. But, in your case, do you have an old coal room in basement? Many of the older homes in Pa have these. These rooms stay very cold in winter, if it is not being used, you could use that room. Also, I have used the attic, which stays cold enough to keep them asleep in winter, provided there are alot of strong men around to help carry them up into the attic, these are what I have to do. The coal cellar is much easier, or just let them go dormant and really wrap them good outside along a wall where it gets southern exposure, but I would bring them in if they are too young. or keep them very wrapped and covered and secured on a porch where Ice storms and heavy snow will stay off. Time for a greenhouse for us as well. Ciao