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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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    Nordyne 632484R Flame Sensor

    Nordyne

    MSRP: $40.06
    Now: $30.96
    Nordyne 632484R Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements   Cross...
    MSRP: $40.06
    Now: $30.96
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    Nordyne 626491R Defrost Sensor

    Nordyne

    MSRP: $28.92
    Now: $22.35
    Nordyne 626491R Defrost Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $28.92
    Now: $22.35
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    Nordyne 626488R Defrost Sensor L68-38F

    Nordyne

    MSRP: $36.60
    Now: $28.28
    Nordyne 626488R Defrost Sensor L68-38F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $36.60
    Now: $28.28
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    Robertshaw 10-681 Flame Sensor (Lh33Wz511-Carrier)

    Robertshaw

    MSRP: $36.60
    Now: $28.28
    Robertshaw 10-681 Flame Sensor (Lh33Wz511-Carrier)l  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $36.60
    Now: $28.28
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    Robertshaw 10-650 Sensing Probe Kit

    Robertshaw

    MSRP: $30.59
    Now: $23.18
    Robertshaw 10-650 Sensing Probe Kitl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $30.59
    Now: $23.18
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    MSRP: $30.59
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    Honeywell WRECVR Receiver For Tr Sensors

    Honeywell

    MSRP: $344.52
    Now: $266.22
    Honeywell WRECVR Receiver For Tr Sensorsl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $344.52
    Now: $266.22
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    MSRP: $344.52
    Now: $266.22
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    Honeywell T7750D1004 Elec Temp/Humid Sensor 5To95%Rh

    Honeywell

    MSRP: $64.33
    Now: $49.71
    Honeywell T7750D1004 Elec Temp/Humid Sensor 5To95%Rhl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $64.33
    Now: $49.71
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    MSRP: $64.33
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    Honeywell T775-SENS-WR Water Resistant Sensor, 6' Leads

    Honeywell

    MSRP: $126.80
    Now: $97.98
    Honeywell T775-SENS-WR Water Resistant Sensor, 6' Leadsl   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum...
    MSRP: $126.80
    Now: $97.98
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    MSRP: $126.80
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    Honeywell T775-SENS-STRAP 1097Ohm Strap-on Sensor

    Honeywell

    MSRP: $105.15
    Now: $81.26
    Honeywell T775-SENS-STRAP 1097Ohm Strap-on Sensorl   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $105.15
    Now: $81.26
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    Honeywell T775-SENS-OAT Outdoor Air Tempurature Sensor 1097Ohms

    Honeywell

    MSRP: $126.80
    Now: $97.98
    Honeywell T775-SENS-OAT Outdoor Air Tempurature Sensor 1097Ohmsl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum...
    MSRP: $126.80
    Now: $97.98
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    MSRP: $126.80
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    Honeywell T7022A1010 60/90F Return Air Sensor

    Honeywell

    MSRP: $365.26
    Now: $282.25
    Honeywell T7022A1010 60/90F Return Air Sensorl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $365.26
    Now: $282.25
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    MSRP: $365.26
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    Honeywell LP916B1082 65/85F Return Air Temp. Sensor

    Honeywell

    MSRP: $1,003.78
    Now: $775.65
    Honeywell LP916B1082 65/85F Return Air Temp. Sensorl   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $1,003.78
    Now: $775.65
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    MSRP: $1,003.78
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    Honeywell LP915A1051 Temp Sensr,Da,0-200 F,

    Honeywell

    MSRP: $1,065.06
    Now: $806.86
    Honeywell LP915A1051 Temp Sensr,Da,0-200 F,l  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $1,065.06
    Now: $806.86
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    MSRP: $1,065.06
    Now: $806.86
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    Honeywell LP914A1268 40/240F Duct Mt.Temp.Sensor

    Honeywell

    MSRP: $647.25
    Now: $500.14
    Honeywell LP914A1268 40/240F Duct Mt.Temp.Sensorl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $647.25
    Now: $500.14
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    Honeywell LP914A1029 15" Temp Snr,Da,3-15Psi,40-240F

    Honeywell

    MSRP: $800.76
    Now: $618.77
    Honeywell LP914A1029 15" Temp Snr,Da,3-15Psi,40-240Fl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $800.76
    Now: $618.77
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    MSRP: $800.76
    Now: $618.77
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    Honeywell C7835A1009 Communicating Discharge Air Sensr

    Resideo

    MSRP: $152.03
    Now: $117.48
    Honeywell C7835A1009 Communicating Discharge Air Sensrl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $152.03
    Now: $117.48
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    MSRP: $152.03
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    Honeywell C7772G1004 Wall Mnt Temp Sens W/O Logo

    Honeywell

    MSRP: $60.79
    Now: $46.97
    Honeywell C7772G1004 Wall Mnt Temp Sens W/O Logol  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $60.79
    Now: $46.97
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    MSRP: $60.79
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    Honeywell C7772F1012 Wall Mnt Temp Sens W/ Logo

    Honeywell

    MSRP: $61.26
    Now: $47.34
    Honeywell C7772F1012 Wall Mnt Temp Sens W/ Logol  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $61.26
    Now: $47.34
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    MSRP: $61.26
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    Honeywell C7772F1004 Wall Mnt Temp Sens W/O Logo

    Honeywell

    MSRP: $54.43
    Now: $42.06
    Honeywell C7772F1004 Wall Mnt Temp Sens W/O Logol  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $54.43
    Now: $42.06
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    MSRP: $54.43
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    Honeywell C7772A1004 20Kohm Flush Mt. Temp Snsr Ntc

    Honeywell

    MSRP: $48.89
    Now: $37.78
    Honeywell C7772A1004 20Kohm Flush Mt. Temp Snsr Ntcl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $48.89
    Now: $37.78
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    MSRP: $48.89
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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.