I finally got it. Can you post a screen shot of your settings? I feel like this is a lot like another smart app.
If you only use the internal thermostat sensor, you donāt need to enable the remote sensors, it will automatically look at the thermostat. You set a high and low setpoint (which can be the same) and every time the internal sensors reads more or less it will adjust itself to the temperature you wantā¦So in your case to maintain cooling at 75, your settings would be something like thisā¦
This reads, if the temperature falls below 75, then set (or keep thermostat in auto mode) and set a cooling temperature of 75. (78 heating respectively).

