This could also be achieved with the deco right? I mean when you heat the wifi particles they change color, but from 101-201 The change is minor. So, If you use the deco option which for anyone not aware and reading it is the second icon up from the pause button that looks like a paint roller. Otherwise, You can change the color so you can identify which connects where or to match surrounding materials. But will be visible with the Deco on. Ctrl+B. Otherwise such as jacksonmj stated you have to use heat or temp in the prop settings.
You have to change it Tmp to a higher number but unfortunately, you can't change it's Tmp, you have to change it's temperature (I prefer using PROP) and for each 100C you add, It's Tmp will increase by 1 and that will make it go to the next Wifi channel and change it's color.