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Thermostats / Sensors

Thermostats / Sensors

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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
    Now: $33.26
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    Lennox 56L80 Zone Sensor

    Lennox

    MSRP: $174.12
    Now: $134.55
    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: $174.12
    Now: $134.55
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    Lennox 54G44 Enthalpy Sensor

    Lennox

    MSRP: $56.79
    Now: $43.89
    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: $56.79
    Now: $43.89
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    Lennox 52M72 Flame Sensor

    Lennox

    MSRP: $38.00
    Now: $29.36
    Flame Sensor  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $38.00
    Now: $29.36
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    Lennox 49M84 Flame Sensor

    Lennox

    MSRP: $23.94
    Now: $18.50
    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: $23.94
    Now: $18.50
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    Lennox 49K43 Thermostat

    Lennox

    MSRP: $45.75
    Now: $34.66
    Thermostat   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $45.75
    Now: $34.66
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    Lennox 49K08 Temperature Sensor,12" Probe

    Lennox

    MSRP: $12.75
    Now: $9.86
    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 Requirements    
    MSRP: $12.75
    Now: $9.86
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    Lennox 48G63 SUPPLY Air Sensor

    Lennox

    MSRP: $90.82
    Now: $70.18
    SUPPLY Air Sensor  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $90.82
    Now: $70.18
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    Lennox 47W36 Averaging Space Sensor

    Lennox

    MSRP: $109.40
    Now: $84.53
    Averaging Space Sensor  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $109.40
    Now: $84.53
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    Lennox 47K19 Defrost Sensor

    Lennox

    MSRP: $29.55
    Now: $22.84
    Defrost Sensor  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $29.55
    Now: $22.84
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    Lennox 32M86 Flame Sensor

    Lennox

    MSRP: $5.71
    Now: $4.41
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $5.71
    Now: $4.41
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    Lennox 28W70 Wire Harness W/Defrost Sensor

    Lennox

    MSRP: $113.02
    Now: $87.34
    Wire Harness W/Defrost Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $113.02
    Now: $87.34
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    Lennox 27J02 Flame Sensor

    Lennox

    MSRP: $38.07
    Now: $29.41
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $38.07
    Now: $29.41
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    Lennox 26G10 Defrost Sensor L70-35F

    Lennox

    MSRP: $43.94
    Now: $33.95
    Lennox 26G10  Defrost Sensor L70-35F   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $43.94
    Now: $33.95
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    Lennox 21L99 Flame Sensor

    Lennox

    MSRP: $23.94
    Now: $18.50
    Lennox 21L99 Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $23.94
    Now: $18.50
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    Lennox 17W11 Defrost Thermostat

    Lennox

    MSRP: $35.61
    Now: $27.51
    Defrost Thermostat   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $35.61
    Now: $27.51
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    Lennox 17M50 Humidity Sensor

    Lennox

    MSRP: $432.43
    Now: $334.15
    Humidity Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $432.43
    Now: $334.15
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    Lennox 17J56 Flame Sensor

    Lennox

    MSRP: $22.80
    Now: $17.62
    Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $22.80
    Now: $17.62
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    Lennox 14W86 Defrost Thermostat

    Lennox

    MSRP: $15.87
    Now: $12.27
    Defrost Thermostat  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $15.87
    Now: $12.27
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    Lennox 14K92 OutdoorTemperature Sensor

    Lennox

    MSRP: $30.79
    Now: $23.79
    OutdoorTemperature Sensor  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $30.79
    Now: $23.79
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Thermostats and Sensors for HVAC Systems 

HVAC thermostats and furnace sensors are essential for regulating system performance, energy efficiency, and safety. These components monitor conditions such as temperature, pressure, and flame status, ensuring furnaces, air conditioners, and heat pumps operate correctly. Furnace Part Source offers a wide range of OEM furnace sensors and thermostats for both residential and commercial applications. 

Types of HVAC Thermostats 

  • Non-Programmable Thermostats – Manual models that maintain a set temperature until adjusted.
  • Programmable Thermostats – Digital controls with scheduling features to reduce energy usage during off
  • Smart Thermostats – Wi-Fi connected, app-enabled devices with advanced features like occupancy detection and zoning compatibility. 

Compatibility and Replacement 

Selecting the correct OEM thermostat or sensor ensures accurate readings and reliable operation. Always verify part numbers, voltage requirements, and system configuration (single-stage, multi-stage, or heat pump) before replacing components. 

Maintenance and Upgrades 

Faulty sensors can cause misreadings, wasted energy, or system shutdowns. Replacing worn parts or upgrading to energy-efficient thermostats restores system reliability, reduces utility costs, and extends equipment life. 

Wide Selection from Furnace Part Source 

With access to over 500,000 parts from 300+ manufacturers, Furnace Part Source provides the right solution for any repair or upgrade. From thermistors to programmable thermostats, our catalog includes components designed for both residential and commercial HVAC systems. 

Frequently Asked Questions 

What types of thermostats are available for HVAC systems? 

Options include non-programmable, programmable, and smart thermostats, each offering different levels of control and energy efficiency. 

How do I know if my furnace sensor needs replacement?

Signs include frequent system shutdowns, inaccurate temperature readings, or ignition failures.  

Why should I use OEM furnace sensors? 

OEM parts ensure proper fit, compatibility, and performance, reducing the risk of system malfunctions.

What is the difference between a thermocouple and a flame sensor? 

Thermocouples generate voltage to detect a pilot flame, while modern flame sensors use electronic signals to confirm burner ignition. 

Can upgrading to a smart thermostat improve efficiency?

Yes. Smart thermostats allow remote control, scheduling, and advanced optimization, often reducing energy costs.