> 2. If you are installing a thermostat, or having someone else install a thermostat, > YOU MUST RUN A COMMON. Repeat, YOU MUST RUN A COMMON. I don't care if your current > thermostat is battery powered.
If I am installing a thermostat, I search high and low until I find one like the one that was installed back in '71. It may be round instead of square, but the inside is still nothing but a vial of mercury on a coiled strip of metal and 2 posts for the wires.
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