But in terms of cash flow I like this more than an EV charger or renovation.

. $500 is outrageous and no AC service call should take longer than an hour anyway.

I only have a dozen but that easily brings in $20k a month in net income and requires less than an hour a month worth of work with a PM.

I personally don't like STR's because they are more of a business than an investment(in my opinion).You didn't mention the amount of hours that you and your spouse work but I would have to assume it be between 1900 to 2200 hours assuming you work 48 weeks and between 40 to 50 hours a week.If you buy a STR and self-manage it, you are added 200-300 hours per year in additional work making your life more stressful and less time to do things that you enjoy.Best of luck. 

I've exhausted my effort there..

You'll find some really great tenants, less turnover, and a higher rental rate than an LTR using this strategy.

A bankruptcy that is years old is less concerning than an eviction that is 2 months ago.  

We usually cut a permanent dryer vent in the wall and use that to exhaust it to the outside (instead of hanging a hose out the window, yikes again).If you don't have forced air in a property (meaning if you have hot water radiators) a mini-split system is one of the most cost-effective ways to cool a house.

That could make a difference because if you're in a heating climate with a gas furnace that could be cheaper to heat with than an electric mini-split as they become less efficient at very low temps. 5.

in addition these value adds are typically on a different timeline than an ADU addition garage conversion (my last rehab was my most expensive ever and took 2 months and one week from guest move out to guest move in).