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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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    Carrier LH33WZ518 Flame Sensor

    Carrier

    MSRP: $31.80
    Now: $24.57
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $31.80
    Now: $24.57
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    Carrier LH33WZ015 Flame Sensor

    Carrier

    MSRP: $116.44
    Now: $89.98
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $116.44
    Now: $89.98
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    MSRP: $116.44
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    Carrier LH33WZ007 Flame Sensor

    Carrier

    MSRP: $126.64
    Now: $97.86
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $126.64
    Now: $97.86
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    MSRP: $126.64
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    Carrier LH33WZ006 Ignitor Sensor

    Carrier

    MSRP: $192.60
    Now: $148.83
    Ignitor Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $192.60
    Now: $148.83
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    MSRP: $192.60
    Now: $148.83
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    Carrier LH33WZ003 Flame Sensor Electrode

    Carrier

    MSRP: $172.67
    Now: $133.43
    Flame Sensor Electrode   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $172.67
    Now: $133.43
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    MSRP: $172.67
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    Carrier HN68GA242 Thermal Sensor Open 295F

    Carrier

    MSRP: $353.51
    Now: $273.17
    Thermal Sensor Open 295F   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $353.51
    Now: $273.17
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    MSRP: $353.51
    Now: $273.17
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    Carrier HK50ZT001 Air Supply Smoke Sensor

    Carrier

    MSRP: $1,189.58
    Now: $919.22
    Air Supply Smoke Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $1,189.58
    Now: $919.22
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    MSRP: $1,189.58
    Now: $919.22
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    Carrier HH79NZ074 VVT4 Zone Sensor

    Carrier

    MSRP: $337.42
    Now: $260.74
    VVT4 Zone Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $337.42
    Now: $260.74
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    MSRP: $337.42
    Now: $260.74
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    Carrier HH79NZ043 Supply Air Temperature Sensor

    Carrier

    MSRP: $220.14
    Now: $170.11
    Supply Air Temperature Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $220.14
    Now: $170.11
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    MSRP: $220.14
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    Carrier HH79NZ031 Temperature Sensor

    Carrier

    MSRP: $281.00
    Now: $217.13
    Carrier HH79NZ031 Temperature Sensor Item is Non Cancelable / Non Returnable FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts -...
    MSRP: $281.00
    Now: $217.13
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    MSRP: $281.00
    Now: $217.13
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    Carrier HH79NZ029 Thermistor Sensor

    Carrier

    MSRP: $142.84
    Now: $110.38
    Carrier HH79NZ029 Thermistor Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $142.84
    Now: $110.38
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    MSRP: $142.84
    Now: $110.38
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    Carrier HH79NZ026 Temperature Sensor-Outside Air

    Carrier

    MSRP: $183.12
    Now: $141.50
    Temperature Sensor-Outside Air   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $183.12
    Now: $141.50
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    MSRP: $183.12
    Now: $141.50
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    Carrier HH79NZ024 Thermistor Sensor

    Carrier

    MSRP: $646.22
    Now: $499.35
    Carrier HH79NZ024  Thermistor Sensor Item is Non Cancelable / Non Returnable FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts -...
    MSRP: $646.22
    Now: $499.35
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    MSRP: $646.22
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    Carrier HH79NZ023 Sensor

    Carrier

    MSRP: $167.92
    Now: $127.21
    Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $167.92
    Now: $127.21
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    MSRP: $167.92
    Now: $127.21
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    Carrier HH79NZ013 Temperature Sensor, Clamp On

    Carrier

    MSRP: $165.79
    Now: $128.11
    Temperature Sensor, Clamp On   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $165.79
    Now: $128.11
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    MSRP: $165.79
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    Carrier HH79AZ001 Sensor (C7150B1020)

    Carrier

    MSRP: $144.01
    Now: $111.28
    Sensor (C7150B1020)   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $144.01
    Now: $111.28
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    MSRP: $144.01
    Now: $111.28
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    Carrier HH57AC080 Enthalpy Sensor

    Carrier

    MSRP: $82.48
    Now: $63.74
    Enthalpy Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $82.48
    Now: $63.74
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    MSRP: $82.48
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    Carrier 50HJ540570 Sensor

    Carrier

    MSRP: $96.31
    Now: $72.96
    Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $96.31
    Now: $72.96
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    MSRP: $96.31
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    Carrier 50DK508237 Supply Air Temperature Sensor

    Carrier

    MSRP: $248.34
    Now: $191.90
    Supply Air Temperature Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $248.34
    Now: $191.90
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    MSRP: $248.34
    Now: $191.90
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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.