Can you have two different Internet providers in the same house?
Two internet providers can operate in the same building. Users can access the internet via their cable company using the same Wi-Fi address. In modern society where nearly everything else is connected to the Internet, having access to the web is necessary.
Can you have 2 Wifis in one house?
Yes, you absolutely can have two separate connections in your house. With the two separate wireless routers you would need to set them on non-overlapping channels and you will be fine.
Will 2 routers interfere each other?
If both the existing and second routers are wireless, their Wi-Fi signals can interfere with each other, causing dropped connections and unpredictable network slowdowns.
Can you have 2 cable providers?
Of course you can have two different providers. Just make sure you have everything hooked up properly and the cable outlets are live. When you ordered the service form Comcast they should have checked if your building has their connections setup.