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Furnace & HVAC Sensors

Furnace & HVAC Sensors

Shop furnace and HVAC replacement sensors for residential, commercial, and industrial heating and cooling systems. Furnace Part Source carries temperature sensors, immersion sensors, humidity sensors, flow sensors, and safety probes from Honeywell, Siemens, Veris Industries, MAMAC Systems, System Sensor, and other leading brands.

Use the product list below to find the correct sensor by part number, sensor type, or equipment model. Always confirm resistance value, output signal, mounting style, and equipment model before ordering to help avoid compatibility issues.

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    Honeywell Analytics M-700061 IR-F9-R407a 0/1000ppm IR Sensor

    Honeywell Analytics

    MSRP: $2,542.25
    Now: $1,925.95
    Honeywell Analytics M-700061 IR-F9-R407a 0/1000ppm IR Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $2,542.25
    Now: $1,925.95
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    MSRP: $2,542.25
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    Honeywell Analytics M-510000 VL-F7-NH3-N4-LPA-MK Sensor

    Honeywell Analytics

    MSRP: $3,458.28
    Now: $2,672.31
    Honeywell Analytics M-510000 VL-F7-NH3-N4-LPA-MK Sensor FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $3,458.28
    Now: $2,672.31
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    MSRP: $3,458.28
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    Honeywell Analytics SPXCDULNO1M Gas Sensor

    Honeywell Analytics

    MSRP: $2,767.31
    Now: $2,096.45
    Honeywell Analytics SPXCDULNO1M Gas Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $2,767.31
    Now: $2,096.45
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    MSRP: $2,767.31
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    Honeywell Analytics S301-IRF-R134A R134A Refrigerant Gas Sensor

    Honeywell Analytics

    MSRP: $3,164.88
    Now: $2,445.59
    Honeywell Analytics S301-IRF-R134A R134A Refrigerant Gas Sensor Item is Non Cancelable / Non Returnable FurnacePartSource.com Commitment Item Typically Ships Within the Same Business...
    MSRP: $3,164.88
    Now: $2,445.59
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    MSRP: $3,164.88
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    Honeywell Analytics S301-IRF-R123 R123 Refrigerant Gas Sensor

    Honeywell Analytics

    MSRP: $3,196.96
    Now: $2,470.38
    Honeywell Analytics S301-IRF-R123 R123 Refrigerant Gas Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $3,196.96
    Now: $2,470.38
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    MSRP: $3,196.96
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    Honeywell Analytics S301-IRF-R11 R11 Refrigerant Gas Sensor

    Honeywell Analytics

    MSRP: $3,246.34
    Now: $2,459.35
    Honeywell Analytics S301-IRF-R11 R11 Refrigerant Gas Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $3,246.34
    Now: $2,459.35
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    MSRP: $3,246.34
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    Fireye NX1021-1 Gas Pressure Sensor

    Fireye

    MSRP: $1,593.26
    Now: $1,231.15
    Fireye NX1021-1 Gas Pressure Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $1,593.26
    Now: $1,231.15
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    MSRP: $1,593.26
    Now: $1,231.15
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    Fireye PXMS-300K Steam Pressure Sensor 0/300,4-20ma

    Fireye

    MSRP: $1,654.34
    Now: $1,253.29
    Fireye PXMS-300K Steam Pressure Sensor 0/300,4-20ma  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $1,654.34
    Now: $1,253.29
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    MSRP: $1,654.34
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    Fireye PXMS-200K Steam Pressure Sensor 0/200,4/20ma

    Fireye

    MSRP: $1,870.79
    Now: $1,445.61
    Fireye PXMS-200K Steam Pressure Sensor 0/200,4/20ma  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $1,870.79
    Now: $1,445.61
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    MSRP: $1,870.79
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    Fireye NX1030-1 Steam Sensor 0/362

    Fireye

    MSRP: $1,692.83
    Now: $1,308.10
    Fireye NX1030-1 Steam Sensor 0/362  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $1,692.83
    Now: $1,308.10
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    MSRP: $1,692.83
    Now: $1,308.10
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    Carrier 0843P-0587 Outdoor Tem/Humidity Sensor

    Carrier

    MSRP: $3,566.82
    Now: $2,756.18
    Carrier 0843P-0587 Outdoor Tem/Humidity Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $3,566.82
    Now: $2,756.18
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    MSRP: $3,566.82
    Now: $2,756.18
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    Trane SEN1092 Co2 Duct Sensor

    Trane

    MSRP: $894.10
    Now: $690.90
    Trane SEN1092 Co2 Duct Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $894.10
    Now: $690.90
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    MSRP: $894.10
    Now: $690.90
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    Trane SEN2128 2.2" Liquid Level Sensor & Gasket

    Trane

    MSRP: $1,343.22
    Now: $1,037.94
    Trane SEN2128 2.2" Liquid Level Sensor & Gasket  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $1,343.22
    Now: $1,037.94
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    MSRP: $1,343.22
    Now: $1,037.94
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    Trane SEN0045 20/90F 2Lead Water Temp Sensor

    Trane

    MSRP: $1,239.00
    Now: $938.64
    Trane SEN0045 20/90F 2Lead Water Temp Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $1,239.00
    Now: $938.64
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    MSRP: $1,239.00
    Now: $938.64
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    Siemens Building Technology QPA2002D Co2 Room Air Quality Sensor 0-10V w/Display

    Siemens Building Technology

    MSRP: $643.50
    Now: $487.50
    Siemens Building Technology QPA2002D Co2 Room Air Quality Sensor 0-10V w/Display  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts -...
    MSRP: $643.50
    Now: $487.50
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    MSRP: $643.50
    Now: $487.50
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    Siemens Building Technology QFA4171 Outdoor Air Rh & T 4-20Ma

    Siemens Building Technology

    MSRP: $871.40
    Now: $673.35
    Siemens Building Technology QFA4171 Outdoor Air Rh & T 4-20Ma  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $871.40
    Now: $673.35
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    MSRP: $871.40
    Now: $673.35
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    Honeywell Analytics SPXCDXSO1SS 25% Oxygen Xcd Sensor

    Honeywell Analytics

    MSRP: $1,186.83
    Now: $917.09
    Honeywell Analytics SPXCDXSO1SS 25% Oxygen Xcd Sensor  FurnacePartSource.com Commitment Always Brand-New Genuine Parts In stock parts ship Same Business Day when ordered by 5PM ET No
    MSRP: $1,186.83
    Now: $917.09
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    MSRP: $1,186.83
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    Honeywell Analytics SPXCDXSFXSS Flammable Cat 0-100% Sensor

    Honeywell Analytics

    MSRP: $1,412.88
    Now: $1,091.77
    Honeywell Analytics SPXCDXSFXSS Flammable Cat 0-100% Sensor  FurnacePartSource.com Commitment Always Brand-New Genuine Parts In stock parts ship Same Business Day when ordered by 5PM ET
    MSRP: $1,412.88
    Now: $1,091.77
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    MSRP: $1,412.88
    Now: $1,091.77
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    Fireye TS-350-4 Temperature Sensor For Z Module Control

    Fireye

    MSRP: $1,512.11
    Now: $1,168.45
    Fireye TS-350-4 Temperature Sensor For Z Module Control  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $1,512.11
    Now: $1,168.45
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    MSRP: $1,512.11
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    Fireye TS752-8 Temperature Sensor 32F To 752F

    Fireye

    MSRP: $1,521.33
    Now: $1,175.58
    Fireye TS752-8 Temperature Sensor 32F To 752F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $1,521.33
    Now: $1,175.58
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    MSRP: $1,521.33
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Furnace & HVAC Sensors

Furnace and HVAC sensors monitor temperature, airflow, flame presence, humidity, and other conditions that keep a heating or cooling system operating safely and efficiently. When a sensor fails or reads inaccurately, it can cause lockouts, poor comfort control, or unsafe operation.

Furnace Part Source carries a wide range of replacement sensors, including duct and immersion temperature sensors, outside air sensors, humidity sensors, flow sensors, and safety-related probes for residential, commercial, and industrial HVAC equipment.

Common Sensors We Carry

Common replacement sensors include:

  • Duct and immersion temperature sensors for supply, return, and water temperature readings.
  • Outside air temperature and humidity sensors for outdoor reset and economizer control.
  • Flow sensors for airflow and duct pressure monitoring.
  • Low-level and safety probe sensors for boiler and water-level protection.
  • Gas and smoke detection sensors for combustible gas and safety monitoring.

How to Find the Right Sensor

Before ordering, confirm the sensor's resistance value (such as 10K or 20K ohm), output signal type, mounting style, and the equipment model it is used with. Sensors that look similar can have different resistance curves or output signals, so matching by part number is the safest approach.

For best fit, compare:

  • Original sensor part number
  • Resistance value or output signal type
  • Sensor style, such as duct, immersion, outside air, or surface-mount
  • Equipment model and control system

Sensors From Leading HVAC Brands

Our catalog includes sensors from Honeywell, Siemens Building Technology, Veris Industries, MAMAC Systems, System Sensor, Dwyer Instruments, Aaon, Kele, and other major manufacturers, covering both standard replacement sensors and specialized industrial sensing equipment.

Need Help Matching a Sensor?

Not sure which sensor you need? Use the part number, resistance value, and control system information from your equipment to narrow the search, or contact Furnace Part Source for help identifying the correct replacement.

HVAC Sensor FAQs

What types of sensors does an HVAC system use?

HVAC systems commonly use temperature sensors, humidity sensors, flow sensors, flame sensors, and safety probes to monitor conditions and support proper system control.

How do I know what resistance value my sensor needs?

Check the original sensor's part number or the equipment documentation, which typically lists the resistance value, such as 10K or 20K ohm, required for compatibility.

Can a bad sensor cause my system to shut down?

Yes. A failed or inaccurate sensor reading can trigger lockouts or prevent proper operation, particularly for safety-related sensors like low-water or flame sensors.

Are furnace sensors and thermostat sensors the same?

No. Furnace and HVAC sensors typically monitor internal equipment conditions, while thermostat sensors read room temperature for comfort control. Always confirm the specific application before ordering.