I have a BS in Electrical Engineering from the University of Arizona and spent 4 years in the military prior to that.

appliances are usually easier to replace.  

I don't aggressively increase rents if a tenant's current rent is within the turn cost / 12.For example, if you need to replace flooring, paint, and fix up a few things... your turn cost might be $5-7k

It would take you approximately 11 years (not factoring in rent appreciation) plus that doesn't factor all the systems you mentioned that need replacement.

If it takes you two months to find a replacement renter, then the original tenant must pay you two months of rent.

Hi everyone, we are thinking of charging a monthly maintenance fee to cover our semiannual preventative maintenance inspections (where we check for leaks, clean the AC unit, replace the furnace filter, etc.) and also a once a year gutter cleaning. 

I’ve spent $51k so far in the last 65 days on property repairs and replacement.

That well could cost you $0 or you may need to replace expensive filters the day after you close.

I have flipped  properties and when the tenet destroys the inside from having to replace sheetrock to fixing cement that was placed in the toilet to AC unit being taken, New HVAC being replaced, the list goes on.

If you're in this for supplimental income or to try to replace your W-2 income, it's a great place to invest!