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Thermostats / Sensors

Thermostats / Sensors

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    York Controls 025-34176-000 Oil Temp Sensor

    York

    MSRP: $304.14
    Now: $235.02
    York Controls 025-34176-000 Oil Temp Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $304.14
    Now: $235.02
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    Lennox X2658 Outdoor Sensor

    Lennox

    MSRP: $24.87
    Now: $19.21
    Outdoor Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $24.87
    Now: $19.21
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    Lennox 99K64 Temp Sensor

    Lennox

    MSRP: $10.25
    Now: $7.92
    Temp Sensor  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $10.25
    Now: $7.92
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    Lennox 97M60 Defrost Sensor

    Lennox

    MSRP: $13.91
    Now: $10.75
    Lennox 97M60 Defrost Sensor FurnacePartSource.com Commitment Always Brand-New Genuine Parts In stock parts ship Same Business Day when ordered by 5PM ET No Minimum Order Requirements unless noted above    
    MSRP: $13.91
    Now: $10.75
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    Lennox 95M54 Thermostat SPST Op70 Cl50 40"

    Lennox

    MSRP: $35.01
    Now: $27.06
    Thermostat SPST Op70 Cl50 40"  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $35.01
    Now: $27.06
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    Lennox 94L60 Wall Mounted Zone Sensor

    Lennox

    MSRP: $174.12
    Now: $134.55
    Wall Mounted Zone Sensor  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $174.12
    Now: $134.55
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    Lennox 93J54 Temperature Sensor

    Lennox

    MSRP: $18.79
    Now: $14.52
    Temperature Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $18.79
    Now: $14.52
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    Lennox 93J53 Return/Discharge Air Sensor

    Lennox

    MSRP: $9.82
    Now: $7.59
    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: $9.82
    Now: $7.59
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    Lennox 93G35 Thermostat/Freeze

    Lennox

    MSRP: $41.33
    Now: $31.94
    Thermostat/Freeze   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $41.33
    Now: $31.94
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    Lennox 90H83 Sensor

    Lennox

    MSRP: $48.38
    Now: $37.38
    Sensor   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $48.38
    Now: $37.38
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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
    Now: $34.64
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    Lennox 83L72 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 - Everytime No Minimum Order Requirements    
    MSRP: $38.00
    Now: $29.36
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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: $51.36
    Now: $39.69
    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: $51.36
    Now: $39.69
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    Lennox 78M23 Discharge Thermostat

    Lennox

    MSRP: $48.92
    Now: $37.80
    Discharge Thermostat  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $48.92
    Now: $37.80
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    Lennox 78H11 Defrost Thermostat L70-35F

    Lennox

    MSRP: $60.39
    Now: $46.66
    Defrost Thermostat L70-35F   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $60.39
    Now: $46.66
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    Lennox 72L27 Defrost Thermostat

    Lennox

    MSRP: $45.26
    Now: $34.97
    Defrost Thermostat  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $45.26
    Now: $34.97
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    Lennox 65W84 Thermostat Switch Freezestat

    Lennox

    MSRP: $32.62
    Now: $25.21
    Thermostat Switch Freezestat  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $32.62
    Now: $25.21
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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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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.