I would look up NARPM and start with them..Below are some questions I would think would be a good starting point for you to see who really treats their company like a business or a hobby.

Window AC units can indeed be treated as tangible personal property with a 5-yr life and be bonus-depreciated or deducted under Section 179. 

Being a real estate professional allows you to treat the income as non-passive, allowing higher high income tax payers to pay less in taxes.

Too many investors treat lenders as an impediment to their deal.

Does anyone know what I can do to treat it ?

(I'm not including expected appreciation in my ROI numbers, I'm just treating that as a bonus). 

Eats up time and money getting rid of a bad tenant (not to mention possible property damage). 

Some manufacturered companies treat it as personal property not real property.

@David Woodside The 500-hour rule allows you to treat rental losses as active, enabling you to offset other income and reduce your tax bill significantly.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.