Switch between ntc resistor sensors time based for other device
It sounds like what you want is a small SPDT relay (maybe a reed relay).







simulate this circuit &ndash; Schematic created using CircuitLab

Turn on the GPIO, the MOSFET (or NPN BJT if you choose - increase R1 if you do) turns on, which energises the relay. The relay then switches between the NTC and the resistor being connected into the circuit.