1. App needs to be very responsive, probably should have some port exposed to communicate with it directly without cloud if needed. Using Samsung Air - Air solution, the app is just annoyingly slow.
2. Provide some basic API to start, stop the device, set the desired temperature.
3. Add some integration with weather forecast for the area - I would prefer to wait for couple hours for better efficiency.
4. You should not feel moving air.
5. By current solutions humidity is removed from air - try to address that.