There is a way to put an offset into the evolution control if a difference is found between actual room temperature and what's being displayed. Keep in mind that the digital display is an averaged reading. You could call your installer and ask them if they could explain to you how to put the offset in yourself, or if they could do it for you.
First thing I would do before changing the display is to verify that no unconditioned air is coming into the back of the control through the hole the thermostat wire uses behind it. These controls don't come off the base very easy and if you don't have experience doing it, you could possibly damage it and void your warranty.
Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.