Cold storage and overhead doors

I am only now beginning to realize what big deals both overhead doors and cold storage are. I guess it is quite possible to consider a garage door and warehouses that can keep the wares stored inside cold as ho-hum subjects.  But I am beginning to understand that doors for large vehicles need to be both large and moveable.  I just read today in Numlock News that cold storage is one of the areas of the economy that is continuing to be very important and economically doing well.