And you don’t mention whether the fuel source is electric or gas or oil.And all of the above assumed a central heating system; it’s quite possible you have electric baseboards that could lead to other questions ...

Aren't you still fully leveraged, just borrowing from a different source?

That is like a chef charging for access to his restaurant before you even eat the food.

Just food for thought: you either have: 1. the money 2.

Or, how are you sourcing? 

Both as a source of rehab funds and funds to use in other markets that are cheaper

And then I quit, thankfully.It's weird with the food, isn't it?

I'm secure; roof over our head, food on table, wife/kids enjoy minor luxuries here n there, school activies etc, and while saving 15-20% income each month. 

@Milan Patel Take a look at My Rent Source.

They simply have less exterior attack surface to defend.Age and life of components: I sourced average useful life for a laundry list of components from InterNACHI and a few other sources to fill in, as well as my own professional experience.