What would you charge to diagnose dead batteries in a thermostat.....$75 trip charge?...

I agree with John, as long as you have someone to call for any issue that may arise, then you are good to go.Make sure you have smart devices like locks and thermostats that you can control from your phone.The most important person you will need is a reliable cleaner!! 

Smart thermostat or programmable is always a good idea for energy savings (more important if you are including utilities).

All this to say, I want to shout out (sorry for those I am not connected with, the tag doesn't allow me):@John Underwood  @michael baum @luke carl @julie mccoy@paul sandhu (for horror stories and comedy)From which thermostat/locks/water heaters, pots/pans, processes, marketing, all of it... you guys (and gals) have been so helpful.

In a couple of my rentals I have installed Ecobee smart thermostats, and connected them to the tenant's WiFi network.

So, basically when your tenants don't have heat, unless the issue is that they turned off the thermostat, the home warranty is useless.Good luck.

The HVAC unit is working no more or less by conditioning that space, so long as it's a) not pulling return air from the common space, b) is not reading a thermostat temperature from the common space, and c) not dumping an incredible amount of air into the space (all of which should not be happening regardless).

I am installing WiFi controllers for both thermostats so I can monitor and also purchase a cheap wall unit for their bedroom.

. - i.e. digital door locks, wifi controlled thermostats, ring camera on the exterior entrance.  

Turn washer spin speed up to the highest setting because they're unlikely to change it..5 GPM aerator on bathroom faucets1.25 GPM aerator on kitchen faucet1.25 GPM showerhead1.28 gp-flush toilets--I'm only replacing them because they're the horrific 90s toilets that clog CONSTANTLY, as the water savings will literally never pay offNew tub spout diverters because the current ones leak around the edges badlyY-splitter on top load washing machine to connect the washer only to the cold supply (it's not a high-efficiency, so it cleans well at any temperature) Smart thermostat with 74 degrees minimum cooling temp and 71 degrees maximum heating temp until 10 pm, dropping to 68 degrees until 6am Alarms on doors and windows that alert me if either is left open while the heat or AC is onNew windows, because the current ones are single panes in need of heavy maintenance and are already causing problemsPossibly solar screens on two of the windows that get the most light, particularly a west-facing one