I asked my HVAC guy about this once and he said used units generally fall into two categories: either salvaged, working, from a site for some reason - house being torn down, storm damage, unit too big/small for the house - or the unit was a lemon and replaced because of constant problems. 

I am constantly looking and the neighborhoods where good purchase price to rent ratios are good are monitored by other investors and decently prices properties fly off the market.

My end goal is the have multiple properties that I buy and hold for constant cash flow. 

Whether you do that or not, I'd be happy to help, and could live stream property tours via Periscope if necessary.I'm an agent and an investor, though my wholesale deals are pretty much restricted to Tarrant County.

With the University (UVA for those of you who don't know) growing rapidly as well as continuing job-growth (at least in the professional ranks) it is a fabulous place to own rental properties with near constant demand.  

Holding rentals is more a passive income stream.

Very curious if there are unique ways of creating other streams of income within the rental process that someone is doing?

Primarily interested in buy and hold and creating a passive income stream from residential property.  

I listen to them constantly in the car during my commute!

We never waited for something to happen, we were constantly following up and staying up on top of things.