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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 C7041K2005 20K Ohm Ntc Strap-On Sensor

    Honeywell

    MSRP: $44.55
    Now: $34.42
    Honeywell C7041K2005 20K Ohm Ntc Strap-On Sensorl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $44.55
    Now: $34.42
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    Honeywell C7041J2007 12'Averaging Bulb,Temp Sensor

    Honeywell

    MSRP: $160.81
    Now: $124.26
    Honeywell C7041J2007 12'Averaging Bulb,Temp Sensorl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $160.81
    Now: $124.26
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    MSRP: $160.81
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    Honeywell C7041F2006 Outdoor Weather Proof Sens,20K

    Honeywell

    MSRP: $58.16
    Now: $44.94
    Honeywell C7041F2006 Outdoor Weather Proof Sens,20Kl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $58.16
    Now: $44.94
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    MSRP: $58.16
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    Honeywell C7041B2005 Temp Sensor,Duct Mnt,6" 20K

    Honeywell

    MSRP: $40.19
    Now: $31.06
    Honeywell C7041B2005 Temp Sensor,Duct Mnt,6" 20Kl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $40.19
    Now: $31.06
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    Honeywell C7035A1031 Mini Peeper Uv Sensor-40F 1"Mtg

    Honeywell

    MSRP: $1,133.75
    Now: $876.08
    Honeywell C7035A1031 Mini Peeper Uv Sensor-40F 1"Mtgl   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $1,133.75
    Now: $876.08
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    MSRP: $1,133.75
    Now: $876.08
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    Honeywell C7031J2009 12'Averaging Temp Sensor

    Honeywell

    MSRP: $259.78
    Now: $200.74
    Honeywell C7031J2009 12'Averaging Temp Sensorl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $259.78
    Now: $200.74
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    Honeywell C7031G2014 Outdoor Air Temp Sensor

    Honeywell

    MSRP: $155.18
    Now: $119.91
    Honeywell C7031G2014 Outdoor Air Temp Sensorl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $155.18
    Now: $119.91
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    MSRP: $155.18
    Now: $119.91
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    Honeywell C7031G2006 Outdoor Air Sensor,1715Ohm

    Honeywell

    MSRP: $265.96
    Now: $205.52
    Honeywell C7031G2006 Outdoor Air Sensor,1715Ohml  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $265.96
    Now: $205.52
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    Honeywell C7031D2003 Temp Sensor 40-240F

    Honeywell

    MSRP: $123.72
    Now: $95.60
    Honeywell C7031D2003 Temp Sensor 40-240Fl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $123.72
    Now: $95.60
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    MSRP: $123.72
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    Honeywell C7031B2005 Duct Discharge Sensor -40/250F

    Honeywell

    MSRP: $114.43
    Now: $88.42
    Honeywell C7031B2005 Duct Discharge Sensor -40/250Fl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $114.43
    Now: $88.42
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    MSRP: $114.43
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    Honeywell 194950E Hi Accuracy Sensor +-2F

    Honeywell

    MSRP: $29.68
    Now: $22.94
    Honeywell 194950E Hi Accuracy Sensor +-2Fl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $29.68
    Now: $22.94
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    Rheem SP12049D Gas Pilot/24" Ignition Sensor

    Rheem-Ruud

    MSRP: $126.34
    Now: $97.63
    Rheem SP12049D Gas Pilot/24" Ignition Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements ...
    MSRP: $126.34
    Now: $97.63
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    MSRP: $126.34
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    Rheem 47-21777-04 Defrost Sensor L50-22F

    Rheem-Ruud

    MSRP: $24.68
    Now: $19.07
    Rheem 47-21777-04 Defrost Sensor L50-22F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $24.68
    Now: $19.07
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    MSRP: $24.68
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    Honeywell 14001496-001 Adptr Plate Sensor Mt.On 2X4 Box

    Honeywell

    MSRP: $38.03
    Now: $29.39
    Honeywell 14001496-001 Adptr Plate Sensor Mt.On 2X4 Box  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $38.03
    Now: $29.39
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    MSRP: $38.03
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    Honeywell T104C1036 Remote Setpt/Sensor,2 Caps 4Ft

    Resideo

    MSRP: $279.61
    Now: $216.06
    Honeywell T104C1036 Remote Setpt/Sensor,2 Caps 4Ft  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $279.61
    Now: $216.06
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    MSRP: $279.61
    Now: $216.06
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    Honeywell T104B1046 Remote Setpt/Sensor 16' Cap

    Resideo

    MSRP: $238.47
    Now: $184.28
    Honeywell T104B1046 Remote Setpt/Sensor 16' Cap  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $238.47
    Now: $184.28
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    MSRP: $238.47
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    Honeywell T100F1395 Direct Mt Set Pt,Remote Sensor

    Resideo

    MSRP: $85.24
    Now: $65.87
    Honeywell T100F1395 Direct Mt Set Pt,Remote Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $85.24
    Now: $65.87
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    Honeywell T100C1026 Remote Set Pt/Sensor W/Dbl Cap

    Resideo

    MSRP: $254.40
    Now: $196.58
    Honeywell T100C1026 Remote Set Pt/Sensor W/Dbl Cap  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $254.40
    Now: $196.58
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    MSRP: $254.40
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    Honeywell T100B1043 Remote Set Pt/Sensor 16'Cap

    Resideo

    MSRP: $207.42
    Now: $160.28
    Honeywell T100B1043 Remote Set Pt/Sensor 16'Cap  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $207.42
    Now: $160.28
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    MSRP: $207.42
    Now: $160.28
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    Johnson Controls TE-68NT-0N00S 1K Nickel Sensor,White Term Block

    Johnson Controls

    MSRP: $106.34
    Now: $82.17
    Johnson Controls TE-68NT-0N00S 1K Nickel Sensor,White Term Block  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum...
    MSRP: $106.34
    Now: $82.17
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    MSRP: $106.34
    Now: $82.17
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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.