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Thermistors & Thermistor Probes

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hvac temperature sensors

Thermistors are thermally sensitive resistors whose electrical resistance varies precisely and predictably with temperature. Thermistors are ideal for monitoring and controlling temperature in heating, ventilation, and air conditioning (HVAC) systems.

Our HVAC Sensing Solutions

Thermistors

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Thermistor Probes

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RTD Sensors

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RTD Probes

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Custom Sensors

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HVAC Thermistors

An HVAC thermistor, generally packaged as part of a thermistor probe, is mechanically and thermally positioned within an HVAC system to send signals to the control system which adjusts the operation of system components based on deviations from the target temperature. For instance, a thermistor mounted on the evaporator coil may trigger an automatic defrost cycle thereby making for a more efficient system.

Motors

Depending on the design, HVAC systems can have several types of motors to power blowers, condenser or compression fans, and compressors. Based on thermistor inputs, the control system regulates the status and speed of the various motors. Of course, proper temperature measurement and control minimizes the work performed and reduces the overall energy used by the HVAC system.

Supplying Customers Across the Globe!

EI Sensors are used in markets and applications worldwide. We offer our global clients a range of standard and custom thermistors, RTDs, and probes. If you have questions about which of our standard products will perform best in your application, contact us, and we’ll be happy to help. We will gladly work with you to create a custom solution for any unique temperature measurement needs.

thermistors for hvac application

In HVAC applications, thermistors are used to monitor the temperature of condenser coils, temperatures in ducts, internal and outside air environments, flooring, etc.

SURFACE TEMPERATURE SENSING THERMISTOR PROBES

ED35 GLASS ENCAPSULATED
NTC THERMISTORS, DO-35

EPT1 PRECISION INTERCHANGEABLE BARE LEAD WIRES

Temperature Sensing Insights

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PTC Thermistors, What They Are and How They Work

By EI Sensor • July 24, 2025
Learn what PTC thermistors are, how they work, and their key applications in temperature sensing, overcurrent protection, and industrial control systems.
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What is a Thermistor?

By EI Sensor • July 24, 2025
Thermistors are THERMally sensitive resISTORS whose electrical resistance varies predictably with their body temperature, making them ideal tools for monitoring and controlling temperature in numerous applications including household and industrial products.
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Types of Temperature Sensors

June 2, 2025
Temperature sensors measure and quantify temperature in materials and internal or external environments.
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partner with ei sensor

Using the highest quality materials, state of the art equipment and proprietary production techniques, EI Sensor is dedicated to producing a temperature sensor that meets or exceeds our customers’ requirements. With a strong commitment to quality, continuous improvement is necessary. Our team continues to invest in research and development of new processes as well as enhancing existing processes that will result in a precise, efficient, cost effective thermistor, RTD or temperature probe assembly.