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Since your question relates to "future proofing," it all depends on where you think thermostat technology is headed. These days, I would not ever install less than 18/7 thermostat wire if I had a choice. This also happens to be the number of wires that you need for your setup if you tie your humidifier common to the system common and use the ecobee3 ...


It is presumed that your question is aimed at minimizing Electromagnetic Interference (EMI). The answer is VERY difficult to be precise for your case. EMI depends on many factors, however, for your case the variables you should be interested in are: the separation between the cables and for how long the two cables run together. Separation is ...

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