So the issue would be if you own several SFR's worth $200,000 each, with leverage, wouldn't it be more efficient to own a small apartment building or strip mall somewhere.

In this type of application, your house is divided into different “zones”, which is defined as spaces where there’s a need for targeted cooling or heating.As whole, this configuration of the ductless mini split system enables you to effectively create a whole-home comfort and climate control system that will not only resolve common hot spot and cold spot issues but also address your need for efficient use of energy when it comes to your cooling and heating system.

We are just always looking for efficiencies.

I would follow Ashish's advice for tax efficiency. 

Further, recent advancements in insolation, heating systems, and window materials have greatly improved the energy efficiency of new homes compared to homes built 15 or more years ago.

Take a look at mini splits they are very efficient but only heat down to about -15 degrees.

Or are there any more effective and efficient ways to get these leads?

I'm also looking to connect with investors who care about things like energy efficiency and creating value for people in poor neighborhoods while minimizing gentrification.My best,-Whit

They were extremely helpful, responsive and efficient in my closing process.

I will tell you the stick built homes are much more energy efficient, way better built, and are worth much more.