If the temperature goes below freezing point, pipes might burst.

Exhaust all of your conventional or government financing options before you get into DSCR. 

There are many horror stories on collecting for damages from OTAs including a current thread on BP where guest left doors and windows open upon exit that resulted in frozen pipes.  

It is exhausting to live in a job site and feel like you are bleeding cash, but we've done a couple of times and still think it's a good idea.

Plumbing: The plumber spent hours cleaning out “flushable wipes” from the pipes.

And now pipes froze cause no heat, and now it's $14k more to fix pipes, I gotta walk away" and "seller" says "like hell you will, you destroyed my property, you messed up my credit, now I'm getting foreclosure warnings from bank, YOU CHEATED ME". 

Using 18 inch plastic water pipe cut along one side length ways. 

There were plenty of challenges from removing a homeless person off the property to a water pipe in the basement letting go.

I started my OOS HML  career in Detroit and that was 2002 and WOW coming from our area what an education I got.. my clients that were doing turnkey at the time and all the buyers were out of state ( basically LA based) the local on the ground operator was very good he had all sorts of tricks to try to keep the houses safe.. the one i really liked was painting the copper pipes grey so thieves would not steal them..

  #4 is a pipe dream!!!