You can as long as they are compatible. They have to be 2.4 Ghz Zigbee compliant. You will have to know how to default your existing sensors and pair them to your touch screen. If they are not compatible, you can get some for cheap on eBay or Amazon.com. I have been getting compatible sensors on eBay and Amzon.com for a lot less than Xfinity charges for these and installing them myself. I personally think I installed these better than THEY have. They installed a motion sensor and magnetic door/window sensors IMPROPERLY. I actually READ the instrucitons which they did not. When isntlaling the magnetic door/window sensors, the instrucitons say to install the senor on the non-movable part and the magnetic on the movable part, they did the opposite. Also they instlaled a motion sensor using double stick tape, the sensor already fell off the wall...the sensors come with screws, why did they not use these? Obviously if you are going to install these yourself, you will take more care in installing them correctly as it is your property you are protecting, if someone else does it, they don't care, its just another job for them.