Plus, you're going to get hit with robust financing costs and fees on the buy, making it that much harder to get your cash out. 

Hi Ryan,They are probably not window units, they are probably sleeve units (or at least they should be).Sleeve units are front and rear openings only, window units have openings on the sides also, and are not recommended for sleeve installs.Inventory them all regarding where they are at, (Unit Data) manufacturer, serial number, and age (figure it out on the internet).You should also include in your inventory, (Replacement Data) sleeve size, plug type (there are different plug types they can have), BTU and amperage draw includes heater function or not.Unless you have whole house surge protection the electronic ones MIGHT not last as long as the Mechanical ones, if you have a choice Mechanical (old fashioned controls) type seem to be more Robust.HUD gives a service life of 10 years for window and sleeve units.On a 28 unit building, if it were mine, I would have on hand (a replacement pile of) 2 or 3 replacements of each separate type (based on the Replacement Data types) ready to go.

I was also curious, as to the functioning of LLC.

We have to replace everything except the framing and reconfigure the floor plan to make it more open and functional.

The landlord provides a habitable property with functioning items per the lease.

It’s so that a tenant can’t lock themselves out but I’d rather have a non locking functional door knob, in addition to the dead bolt.

It is important to make sure that things function well rather than having a check list of amenities. 

And trust me I’m a tech guy that likes advanced and functional.

I have heard a lot about Quickbooks and other various software's but I don't think I'm at the point where I need something as robust as those right now.Does anyone have a good beginner accounting software they recommend?

Some HOA managers also manage individual units for owners, finding & managing tenants.Some are great at the two totally different functions, but many won't be great at managing rentals.