I certainly don't have the people or the systems setup yet to be able to handle even that much work.

However, it was an FHA appraisal, which as I understand it goes into the system. 

I engaged a licensed HVAC contractor to do my central air systems- I’ve been burnt in the past, so my code going forward, is to buy materials myself, and pay the labor upon completions or milestones- The issue with HVAC is suppliers will only sell to licensed contractors, not homeowners.  

@Lev PaleiWith the right systems, a good handyman could self-manage and do the upkeep on maybe 20 properly hardened SFR before maintaining them seriously started cutting into his time.

How many circulator pumps are on the system?

@Raul Velazquez Jr Everyone is different - some with an accounting background or general knowledge about accounting can handle tax prep on their own with one, maybe two properties.Others like to put systems in place and hire out right away, to free up there time to spend on more valuable tasks and actions.If the latter describes you, I would say start speaking with real estate savvy CPAs ASAP.

.- V/R Troy

Know the numbers and do not fall in love with a deal if the numbers do not work.V/R - Troy

We have the intentions of keeping this duplex long-term as it is the start of our real estate investments, but want to know whether it is a wise investment to upgrade to central heating and air in Ohio given that we will have to run two sepearte systems and all duct work in addition to upgrading the electric box.

After you have the septic systems inspected and everything checks out you can assume each one pumped every 5 years (assuming 1:1 septic to home ratio).