Talk to your HVAC specialist and see what they have for your particular system. 

@Scott Smith@Bernard Reisz is a CPA and SDIRA specialist.

I am not an attorney but a commercial real estate brokerage.I also agree to the statement of find a specialist to get the best service.

I am a short sale specialist.

The responses were:2 disconnects, 2 wrong numbers, 1 "we don't do that", 3 answering machines, 1 receptionist, and 1 that just continued to ring.At that point, I figured I would rather travel a bit and work with a real specialist in the subject regardless of their location.I actually put "attorney atlanta" into BiggerPockets' search box.

If it wasn't for my brain aneurism and stroke at 54 years old I'd probably still be doing that but it has almost been about 9 years since that happened and I still cannot walk, drive, and work ever since but I've been learning a lot about real estate investing, sales, and businesses.I believe college is good today for learning to become a specialist, like Doctors and Lawyers and maturity. 

You buy, fix up, and sell to a cash flow specialist.

I'd suggest attending any and all REI meetings in your area first.Then, call all of the local real estate agents and ask to speak to their in-house investor specialist.  

You need an operating agreement drawn up by a specialist attorney.

Property managers are handling finding and screening tenants, finding specialists to fix issues in the building.