OK, I have some major updates regarding my investment with MI.I had an inspector go out and take a look at it during construction and he found MAJOR problems ranging from possible asbestos insulation being airborne, lead-based paint cracking, cracks in the foundation and crawl space, old knob and tube wiring, moisture and mold issues, roof shingles replacement, and loads of other issues.Rather than talking about them, I made a playlist of the inspection here: https://www.youtube.com/watch?

That attracts moisture and vermin.

For example, there is no insulation under the floor or around pipes, part of the roof needs repair and half of it appears to have 3 layers of roofing material, single pane windows presenting a moisture problem, some failing siding, etc. 

Lack of ventilation allows for the moisture to build.

But it's not cheap, and I don't think you really need it unless you're having a significant moisture problem. 

flood zones....too old....and i want to say underground basement moisture and mold issues. but kinda on the fence w/that one.

I also agree with @Jay Hinrichs mold is usually created by a tenant, but also sometimes by an owner being neglectful, but whatever it is it is one of those issues for my renovation biz, even though I now know much more on mold (got great info from a mold removal guy here on BP too) and even though most mold is NOT the toxic strain, can be cleaned up relatively easily and IF the moisture source is eliminated, will not return.

Additionally, you will be creating more condensation in the attic than you want there which will lead to moisture damage and possibly (probably) mould.I would definitely plan to move the furnace into a conditioned space.

I would do whatever is necessary to get rid of your moisture problem.

I've installed laminates primarily for several years but am starting to lean towards vinyl plank flooring because I think it will hold up better to moisture and because it's easier to transport.