Every digital thermostat panel I've come across - just HORRENDOUS!
- There's a temperature display. Fine.
- There's an up and down arrow. First thought, it's to change the temperature. Good.
- There's the hold button. This is where it starts to get ugly.
So I want to change the temperature. Most thermostats will change the display to the temperature as I press the up and down arrows. They then have me hold the hold button for a while to lock in the new temperature. As a user, I find it frustrating that:
- I didn't know if I held it long enough because most of them won't give me an audible or visible feedback to tell me that the system is working on getting to the temperature I've set.
- The temperature on the display will change back almost immediately to the current temperature in the room, which makes me even more uncertain if my setting was actually accepted.
- I have to click the up or down arrow to find out whether the current temperature is at the desired temperature. Those two buttons are for setting, not for checking.
What would you recommend for such a thermostat UI design so that most users will immediately know what to do and how to tell whether the unit is working to get the room to be at a particular temperature?