You should let Comcast install the thermostat initially. Just make sure that the batteries are installed properly and that the technician installs a 24v DC power source from your HVAC system or a separate transformer...if Comcast does not want to run wires from your HVAC system, you might have to get an electrician or your heating or air conditioning contractor...Comcast will not run wiring, they will only connect wires that are there...good luck...post your outcome!
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