There are many different factors that affect the temperature reading on Mysa. Everything from where Mysa is mounted to the type of wall material, can affect the temperature displayed on Mysa. Mysa also factors in humidity and current passing through, to determine room temperature.
Note: When using an external room temperature sensor to measure the room temperature, don't lay it on top of Mysa. This is because Mysa vents out air through the top of the unit, and this can severely impact the ability of the temperature sensor to measure the temperature correctly.