@Yongming HuangI’m going to make an assumption your comparison is versus China agent commissions around 2.1%.  

Add in that money goes out many months before any generated income, the worse financing options versus purchase financing, the detraction of something (even if it is just yard space) from the primary unit, the work involved even hands off is at least as high as a BRRRR but a brrrr can provide an infinite return. 

This can result in someone abusing the system and overfunding loans that should not have been funded in the first place.

Did someone install too small a system, did the Freon leak out, are the air filters dirty. 

Yes the others are correct - more of a sales tool.If you are looking to track and manage your properties you may want to research a system like Stessa which I believe has a free version for smaller portfolios.

How old is the HVAC system? 

I have 2 4,500 sq ft indoor pool homes just finished up and because of material selection and sprinkler system the insurance is less than my 3 bed pool home a 1/4 mile away.

This raises the cost of using an STR versus using a hotel. 

I will have to provide and buy all the finishing (cabinets, countertops, tile, flooring, etc), but they demo and install everything.For the garage conversion, including the walk-in pantry and 2 bedrooms, the mini-split system, taking out the garage door and framing it and adding siding to look like the rest of the house, and add 1 window in each bedroom, the quote was $40k.I would love to get your opinions.  

Agreed I did hire a property manager just as soon as I got the complaint I just don’t want to deal with anything legal/court system especially in dcmy lawyer advised me that if I can settle for a month or two of free rent so do it but you’re right having my attorney handle all communications mivhh is by forward