The color scale is not used consistantly.
In heat mode, the color is orange, and the orange scale shows when heating would be active.
In cool mode, the color is blue, and the blue scale shows when cooling is NOT active.
In heat_cool mode, the color is green, and shows neither heating or cooling is active.
Why not flip the blue scale, get rid of the green scale and replace with orange to target_temp_low and blue from target_temp_ high
And maybe a solid white pointer triangle where the current temperature is.