Depending on how your house is laid out, you can run cable to other rooms. If it is a two story house, look for something that leads right into the attic. Run up to the attic and then down the walls. You will be able to see the top 2x4 plate of a given wall from above.
For main floor or bungalow, you can run from below if the basement isn't developed.
You can also run through cold air returns. Just for safety make sure you buy the fire rated cable.
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