Thermostats vary by design, but digital thermostats typically have both the current temperature and the target temperature. Traditional thermostats generally have a knob or lever attached to a marker that points to the desired temperature.
Thermostats for units that provide both heating and cooling often indicate whether the unit is set to generate heat or cool the air, and many have an "auto" mode that switches between the two. Programmable thermostats allow users to change what temperature is targeted at different points during the day or during the week. Almost all of these thermostats are digital. There is no standard for programmable thermostat displays; users may need to rely on their operation manual.