A:Answer As soon as you have no (or Poor) wireless connectivity some where in or around your home and you want it. I have three in my house (one on each flloor) and we love it. We never have a problem with any device connecting. I have about a 2,000 Sq foot home - three levels, a deck in the back and a patio on the side. Everything is completely covered. So, you know by the performance of your connectivity. If you dont have or lose your signal or if it's constantly poor, I would add a unit. One unit is really good, 2 is better and three is great etc...
