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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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    Siemens QAM2030.500 10K Ohm Ntc Duct Sensor, 16'Prob,Tp2

    Siemens Building Technology

    MSRP: $124.90
    Now: $96.52
    Siemens QAM2030.500 10K Ohm Ntc Duct Sensor, 16'Prob,Tp2  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $124.90
    Now: $96.52
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    MSRP: $124.90
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    Siemens QAM2030.250 10K Ohm Ntc Duct Sensor, 8'Prob,Typ2

    Siemens Building Technology

    MSRP: $107.32
    Now: $82.93
    Siemens QAM2030.250 10K Ohm Ntc Duct Sensor, 8'Prob,Typ2 Duct Temperature Sensor 10k Oh
    MSRP: $107.32
    Now: $82.93
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    Siemens QAM2030.045 10K Ohm Ntc Duct Sensor, 18"Prob,Ty2

    Siemens Building Technology

    MSRP: $39.20
    Now: $30.29
    Siemens QAM2030.045 10K Ohm Ntc Duct Sensor, 18"Prob,Ty2  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $39.20
    Now: $30.29
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    Siemens QAM2030.020 10K Ohm Ntc Duct Sensor, 8"Prob, Typ2

    Siemens Building Technology

    MSRP: $37.27
    Now: $28.80
    Siemens QAM2030.020 10K Ohm Ntc Duct Sensor, 8"Prob, Typ2  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $37.27
    Now: $28.80
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    Siemens QAM2030.010 Duct Sensor 10K Ohm 4" Long

    Siemens Building Technology

    MSRP: $35.56
    Now: $27.48
    Siemens QAM2030.010 Duct Sensor 10K Ohm 4" Long  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $35.56
    Now: $27.48
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    Siemens QAM2012.045 Duct Temp Sensor 1000 Ohm 18" Plat

    Siemens Building Technology

    MSRP: $46.86
    Now: $36.21
    Siemens QAM2012.045 Duct Temp Sensor 1000 Ohm 18" Plat  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $46.86
    Now: $36.21
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    Siemens QAH11.1 Changeover / Remote Sensor

    Siemens Building Technology

    MSRP: $18.76
    Now: $14.50
    Siemens QAH11.1 Changeover / Remote Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $18.76
    Now: $14.50
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    MSRP: $18.76
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    Siemens QAE2030.005 Imm Temp Ntc Snr, 10K Ohm, Ty2,2.5"

    Siemens Building Technology

    MSRP: $77.50
    Now: $59.89
    Siemens QAE2030.005 Imm Temp Ntc Snr, 10K Ohm, Ty2,2.5"  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $77.50
    Now: $59.89
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    Siemens QAE2020.005 Imm Well Sensor Ni 1000 Ohm, 2.5"

    Siemens Building Technology

    MSRP: $96.87
    Now: $74.86
    Siemens QAE2020.005 Imm Well Sensor Ni 1000 Ohm, 2.5"  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $96.87
    Now: $74.86
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    MSRP: $96.87
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    Siemens QAE2012.015 Imrsn Temp Plat Sensor, 1000 Ohm, 6"Pr

    Siemens Building Technology

    MSRP: $97.94
    Now: $75.68
    Siemens QAE2012.015 Imrsn Temp Plat Sensor, 1000 Ohm, 6"Pr  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $97.94
    Now: $75.68
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    Siemens QAE2012.010 Imrsn Temp Plat Sensor, 1000 Ohm, 4"

    Siemens Building Technology

    MSRP: $93.24
    Now: $72.05
    Siemens QAE2012.010 Imrsn Temp Plat Sensor, 1000 Ohm, 4"   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $93.24
    Now: $72.05
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    MSRP: $93.24
    Now: $72.05
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    Siemens QAE2012.005 Imrsn Temp Plat Sensor, 1000 Ohm, 2.5"

    Siemens Building Technology

    MSRP: $89.23
    Now: $68.95
    Siemens QAE2012.005 Imrsn Temp Plat Sensor, 1000 Ohm, 2.5"  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $89.23
    Now: $68.95
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    MSRP: $89.23
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    Siemens QAD2030U Pipe Strap-On Ntc Temp Sensor, 10K Ohm

    Siemens Building Technology

    MSRP: $72.48
    Now: $56.01
    Siemens QAD2030U Pipe Strap-On Ntc Temp Sensor, 10K Ohm  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $72.48
    Now: $56.01
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    MSRP: $72.48
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    Siemens QAD2012U Pipe Strap-Ontemp Plat Sensor, 1K

    Siemens Building Technology

    MSRP: $89.92
    Now: $69.49
    Siemens QAD2012U Pipe Strap-Ontemp Plat Sensor, 1K  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $89.92
    Now: $69.49
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    MSRP: $89.92
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    Siemens QAC2030U Outdr Ntc Temp Sensor, 10K Ohm,Typ2

    Siemens Building Technology

    MSRP: $60.60
    Now: $46.83
    Siemens QAC2030U Outdr Ntc Temp Sensor, 10K Ohm,Typ2  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $60.60
    Now: $46.83
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    MSRP: $60.60
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    Siemens QAC2012U Outdr Plat Temp Sensor, 1000 Ohm

    Siemens Building Technology

    MSRP: $70.47
    Now: $54.46
    Siemens QAC2012U Outdr Plat Temp Sensor, 1000 Ohm  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $70.47
    Now: $54.46
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    MSRP: $70.47
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    Siemens QAA22SS.EWSN 55/95F Rm Sensor; 0-5V/10V/4-20Ma

    Siemens Building Technology

    MSRP: $155.36
    Now: $120.05
    Siemens QAA22SS.EWSN 55/95F Rm Sensor; 0-5V/10V/4-20Ma  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $155.36
    Now: $120.05
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    MSRP: $155.36
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    Siemens AQF3100 Sunshield For Qfa Sensor

    Siemens Building Technology

    MSRP: $39.12
    Now: $30.23
    Siemens AQF3100 Sunshield For Qfa Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $39.12
    Now: $30.23
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    MSRP: $39.12
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    Siemens 7MF15654CD005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-300

    Siemens Building Technology

    MSRP: $444.10
    Now: $343.17
    Siemens 7MF15654CD005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-300  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $444.10
    Now: $343.17
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    MSRP: $444.10
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    Siemens 7MF15654CB105EA1 Sensor, Liquid/Gas, 0-10V, 0-200#

    Siemens Building Technology

    MSRP: $422.96
    Now: $326.83
    Siemens 7MF15654CB105EA1 Sensor, Liquid/Gas, 0-10V, 0-200#  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $422.96
    Now: $326.83
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    MSRP: $422.96
    Now: $326.83
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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.