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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Lennox 99K64 Temp Sensor

Lennox

MSRP: $10.54

Now: $8.15

Temp Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $10.54

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Lennox 97M60 Defrost Sensor

Lennox

MSRP: $14.72

Now: $11.37

Lennox 97M60 Defrost Sensor FurnacePartSource.com Commitment

MSRP: $14.72

Now: $11.37

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Lennox 94L60 Wall Mounted Zone Sensor

Lennox

MSRP: $182.82

Now: $141.27

Wall Mounted Zone Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $182.82

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Lennox 93J54 Temperature Sensor

Lennox

MSRP: $19.35

Now: $14.96

Temperature Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $19.35

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Lennox 93J53 Return/Discharge Air Sensor

Lennox

MSRP: $10.11

Now: $7.82

Return/Discharge Air Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $10.11

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Lennox 90H83 Sensor

Lennox

MSRP: $49.81

Now: $38.49

Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $49.81

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Lennox 88K38 Discharge Air Sensor

Lennox

MSRP: $44.83

Now: $34.64

Discharge Air Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $44.83

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Lennox 83L72 Flame Sensor

Lennox

MSRP: $39.14

Now: $30.24

Flame Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $39.14

Now: $30.24

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Lennox 79L60 Flame Sensor Lead

Lennox

MSRP: $21.45

Now: $16.25

Flame Sensor Lead FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $21.45

Now: $16.25

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Lennox 79J11 Freezestat Opens 29F CLS 50F

Lennox

MSRP: $52.93

Now: $40.90

Freezestat Opens 29F CLS 50F FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $52.93

Now: $40.90

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Lennox 64L99 Flame Sensor Lead

Lennox

MSRP: $43.05

Now: $33.26

Flame Sensor Lead FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $43.05

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Lennox 56L80 Zone Sensor

Lennox

MSRP: $182.82

Now: $141.27

PART HAS BEEN DISCONTINUED - Please Call 1-866-620-8417 For Availability or ReplacementLennox 56L80 Zone Sensor (Obsolete/Discontinued) We're sorry--this item may no longer be available.

MSRP: $182.82

Now: $141.27

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Lennox 54G44 Enthalpy Sensor

Lennox

MSRP: $58.51

Now: $45.21

Lennox 54G44 Enthalpy Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $58.51

Now: $45.21

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Lennox 52M72 Flame Sensor

Lennox

MSRP: $35.23

Now: $27.22

Flame Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $35.23

Now: $27.22

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Lennox 49M84 Flame Sensor

Lennox

MSRP: $24.67

Now: $19.06

Lennox 49M84 Flame Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $24.67

Now: $19.06

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Lennox 49K08 Temperature Sensor,12" Probe

Lennox

MSRP: $13.15

Now: $10.16

Lennox 49K08 Temperature Sensor,12" Probe FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...

MSRP: $13.15

Now: $10.16

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Lennox 48G63 SUPPLY Air Sensor

Lennox

MSRP: $93.54

Now: $72.28

SUPPLY Air Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $93.54

Now: $72.28

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Lennox 47W36 Averaging Space Sensor

Lennox

MSRP: $114.87

Now: $88.77

Averaging Space Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $114.87

Now: $88.77

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Lennox 47K19 Defrost Sensor

Lennox

MSRP: $34.98

Now: $27.03

Defrost Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $34.98

Now: $27.03

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Lennox 32M86 Flame Sensor

Lennox

MSRP: $5.87

Now: $4.54

Flame Sensor FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $5.87

Now: $4.54

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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.

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