You can extend thermistor lines 30 feet or so with no problem. The additional resistance in the wiring might change the setpoint a fraction of a degree, oh dear. Given all the other stuff you have running, it wouldn't hurt and might help to use shielded cable.
I once built a bunch of thermocouple junctions for a science experiment. All that was needed was stripping a bit of insulation from the end of the TC cable, twisting or otherwise putting the two wires in contact at their ends, and a moment in an oxyacetylene torch flame.
Dave
And airline pilots, who have to read complex display panels overhead.
Dave
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