The thing to remember is The Thermostat is a huge part of your energy costs and I suggest checking out the ECOBEE 3.

Or the tenant doesnt know how to work the thermostat.

The electric space heater is the best option, most will work with a thermostat.

No manual for thermostat so they can't figure out how to program it;11.

Having small, new things like shower heads that aren't water stained, toilet seats that are new, new or really clean window coverings, clean/new switch covers, programmable thermostat will also set you apart from the norm.

. * The plan also includes spending $250,000 in capex in 2017 and 2018: Change all thermostats to "landlord friendly," replace all toilets with 1.6gpf models (as well as low-flow shower heads and sink aerators), and replace all lights with LED.

I'm not an HVAC tech but if the condenser motor is not as powerful as the blower motor that is supposed to be in there, it makes sense that the fan stays on longer since it is taking longer fill the unit with hot air to the point where the thermostat reaches its designated temp set point and turns off the fan/heat mode.

How we have it set up now it that the lower (control over the thermostat) pays gas and the upper pays water. 

You can do everything from keyless entry to noise monitoring to energy usage monitoring to remote thermostats... 

Thermostat does not work; the display screen doesn't properly display so we cannot see the temperature or know what it is changing to when we hit buttons 4.