A gas detector system for a refrigerated interior volume of a transportation refrigeration unit, TRU, the gas detector system comprising: a heated non-dispersive infrared, NDIR, gas detector for flammable low global warming potential, GWP, refrigerants that defines an enclosure, the enclosure defines a chamber therein, a cover including a chamber opening, and an infrared sensing element within the chamber; a heater adjacent to or within the enclosure, the heater configured to reduce moisture within the chamber and/or prevent moisture from accumulating within the chamber during a refrigeration cycle; a controller configured to control the heater, a gas detector element; gas detector electronics configured to control operations of the gas detector element and to communicate with the controller and a printed circuit board on which the gas detector element and the gas detector electronics are disposed, wherein the gas detector system is configured to detect a selected concentration of refrigerant and thus to detect a refrigerant leak within the refrigerated interior volume of the TRU, wherein the gas detector system comprises an enclosure temperature sensor disposed inside or proximate to the enclosure, an ambient temperature sensor disposed outside of the refrigerated interior volume, wherein the controller is configured to compare temperature readings from the enclosure temperature sensor and the ambient temperature sensor and utilize the comparison of the readings to control the heater, wherein during the refrigeration cycle: when a temperature inside or proximate to the enclosure is less than ambient temperature, the heater is activated; and when the temperature inside or proximate to the enclosure is greater than ambient temperature, the heater is deactivated. a heated non-dispersive infrared, NDIR, gas detector for flammable low global warming potential, GWP, refrigerants that defines an enclosure, the enclosure defines a chamber therein, a cover including a chamber opening, and an infrared sensing element within the chamber; a heater adjacent to or within the enclosure, the heater configured to reduce moisture within the chamber and/or prevent moisture from accumulating within the chamber during a refrigeration cycle; a controller configured to control the heater, a gas detector element; gas detector electronics configured to control operations of the gas detector element and to communicate with the controller and a printed circuit board on which the gas detector element and the gas detector electronics are disposed, wherein the gas detector system is configured to detect a selected concentration of refrigerant and thus to detect a refrigerant leak within the refrigerated interior volume of the TRU, wherein the gas detector system comprises an enclosure temperature sensor disposed inside or proximate to the enclosure, an ambient temperature sensor disposed outside of the refrigerated interior volume, wherein the controller is configured to compare temperature readings from the enclosure temperature sensor and the ambient temperature sensor and utilize the comparison of the readings to control the heater, wherein during the refrigeration cycle: when a temperature inside or proximate to the enclosure is less than ambient temperature, the heater is activated; and when the temperature inside or proximate to the enclosure is greater than ambient temperature, the heater is deactivated. when a temperature inside or proximate to the enclosure is less than ambient temperature, the heater is activated; and when the temperature inside or proximate to the enclosure is greater than ambient temperature, the heater is deactivated.