I'm setting up the foundation of our property management business and I can't operate our business on fear.

Total real estate ROI should include 1) cash flow, 2) tax benefits realized each tax season in the form of real cash (non-operating items such as depreciation, mortgage interest, RE tax), 3) equity.

He is a one man operation so his working cost are lower.

He operates through phone and e-mail and occasionally will meet a new tenant on a Saturday.  

Window units seem to be just as efficient anyway in my experience; It's the resistance heat that can get expensive but they do make window units now that operate in reverse cycle and there's also 2 ton ductless systems on ebay for about $950 that'd require minimal time to install.

after 1.5 years, We have just received our FAA licensing to operate a drone commercially.  

You might be locked into a longterm contract.Get a hold of the contract that they are operating off of to get the base price.  

I had a question regarding Annual Operating expenses (Operating expenses include: Taxes (property taxes), Insurance, Management, Maintenance, Utilities, and Repair.) 

@Arash ZandiWelcome to the site.Do you have any of your films on youtube?

I'm not new to the industry, construction or real estate, but primariliy I operate in Commercial, Multifamily construction and management.