Looking for advice on my 12 year old modular home set on on a block crawl space, located in Michigan's "tip of the thumb" Background: Recently, the home is vacated in the winter months. The first year the plumbing was winterized and heat turned off and the vents left open. Some noticable damage occured to kitchen floor (center of home) (some raising, buckling of floor occured) The second year the heat was left on low and the vents closed up and a little more damage to the floor occurred. Last spring the crawl space is was very damp (condensation everywhere) The ground is open and very sandy here in michigan. So, I don't know if an automatic sump pump is required or not. If so, I am not sure how to keep it from freezing in the extremely cold winter months. Any advice on how I should winterize this home and tips on the need for a sump pump would be greatly appreciated. This is the third year and I would like to get the cause of the problem fixed before I do anything to repair the floor. Thanks