They have thermostats on them.

Mine can set door codes, message (or call) guests, schedule cleaners, adjust the thermostat, monitor my cameras, & call a plumber just as easily as a local PM can, for 1% of the costHire good cleaners, a solid handyman & befriend some helpful neighbors.

My rentals are class B neighborhood type homes and small apartments.I'm pretty ignorant to the whole smart home product line, a programmable thermostat and remote garage door opener is the fanciest I've used.

Thermostats, thermocouples, the common furnace control board, furnace filters.

My PMs can set door codes, message (or call) guests, schedule cleaners, adjust the thermostat, monitor my cameras, & call a plumber just as easily as a local PM can, for 1% of the cost.Hire good cleaners, a solid handyman & befriend some helpful neighbors.

For the basement apartment's comfort as they can't control their own heat, we got a wireless ecobee thermostat that has wireless sensors.  

There's nothing more frustrating to me than going into a unit I'm paying for heat in and seeing the thermostat cranked to *80, windows open and it's *20 outside. 

Now if anyone has access to the thermostat here in Chicago can you please turn it up a few degrees?

. :)   We are definitely feeling it up here in fact we had an investor friend come home to frozen pipes & a lot of damage yet the thermostat was set at 72.

I did go by to look at a few things last month and noticed she kept the thermostat at 75.