I'd spend your time and energy on an arm's length deal.

Let's get all of the stereotypes out of the way.  Yes, owning affordable/low income housing is more challenging than your typical A or B class property, you will experience more repairs, turnover and maintenance.  How...

Do both...Get a new unit and more energy efficient for your tenant. 

I've been wholesaling for about a year, and have done a handful of deals.I've learned a lot, but I'm ready to take my business to the next level, and make a true business.I getting pretty tempted to sign up with a mentor/guru.  

I have seen how well they have helped him in life and want to take my own investing to the next level by buying larger multifamily projects.  

On the bright side, they still get the job done at an acceptable level (for me at least). 

We will screen those tenants with the same level of due diligence we screen any other tenant.  

The only similar experience I have is running a transit level and grade stick on building foundations and sidewalks. 

We operate at a much much smaller level.

If so it is the same level of effort as changing it yourself.As for charging service call plus repairs, again, I don't know how you can conclusively deduct that a system breaks down exclusively due to dirty filters.