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
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.