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Thermostats / Sensors

Thermostats / Sensors

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    Siemens 141-0522 Spdt 50/150F Surf Mt Chage Over Thermostat

    Siemens Building Technology

    MSRP: $386.69
    Now: $298.81
    Siemens 141-0522 Spdt 50/150F Surf Mt Chage Over Thermostat   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum...
    MSRP: $386.69
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    Siemens 141-0521 Thermostat 2-Pos Rm 100/240

    Siemens Building Technology

    MSRP: $305.88
    Now: $236.36
    Siemens 141-0521 Thermostat 2-Pos Rm 100/240   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements  ...
    MSRP: $305.88
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    Siemens 141-0520 20/120F 6'Cap, Spdt, Temperature Controller

    Siemens Building Technology

    MSRP: $316.42
    Now: $244.51
    Siemens 141-0520 20/120F 6'Cap, Spdt, Temperature Controller  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $316.42
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    Siemens 134-1511 Spdt Freezstat 35/45 Mr 20'X1/8

    Siemens Building Technology

    MSRP: $380.21
    Now: $293.80
    Siemens 134-1511 Spdt Freezstat 35/45 Mr 20'X1/8  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $380.21
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    Siemens 134-1504 4 Wire, 2 Circuit, 15/55F M/R Dpst

    Siemens Building Technology

    MSRP: $495.25
    Now: $382.69
    Siemens 134-1504 4 Wire, 2 Circuit, 15/55F M/R Dpst  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $495.25
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    Siemens 134-1085 Heat/Cl Thermostat, Line Volt, Heavy Duty

    Siemens Building Technology

    MSRP: $340.15
    Now: $262.84
    Siemens 134-1085 Heat/Cl Thermostat, Line Volt, Heavy Duty  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $340.15
    Now: $262.84
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    Siemens 134-1084 Line Voltage Thermostat No Switch

    Siemens Building Technology

    MSRP: $387.22
    Now: $299.22
    Siemens 134-1084 Line Voltage Thermostat No Switch  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $387.22
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    Heil Quaker 24358600 Defrost Sensor

    Heil Quaker

    MSRP: $31.27
    Now: $23.69
    Heil Quaker 24358600 Defrost Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $31.27
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    Heil Quaker 1172766 Defrost Sensor

    International Comfort Products

    MSRP: $32.01
    Now: $24.73
    Heil Quaker 1172766 Defrost Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $32.01
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    Heil Quaker 1170921 Tube Sensor 3/16"Id X 10' Gray

    International Comfort Products

    MSRP: $97.00
    Now: $74.96
    Heil Quaker 1170921 Tube Sensor 3/16"Id X 10' Gray  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $97.00
    Now: $74.96
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    Heil Quaker 1082065 Defrost Sensor L51-20F

    International Comfort Products

    MSRP: $65.13
    Now: $50.32
    Heil Quaker 1082065 Defrost Sensor L51-20F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $65.13
    Now: $50.32
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    Heil Quaker 1064310 Defrost Sensor

    International Comfort Products

    MSRP: $28.73
    Now: $22.20
    Heil Quaker 1064310 Defrost Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $28.73
    Now: $22.20
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    Heil Quaker 1052807 Sensor

    Heil Quaker

    MSRP: $40.69
    Now: $30.83
    Heil Quaker 1052807 Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross References
    MSRP: $40.69
    Now: $30.83
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    Heil Quaker 1006298 Tube Sensor 3/16"Id X 36"

    International Comfort Products

    MSRP: $20.61
    Now: $15.92
    Heil Quaker 1006298 Tube Sensor 3/16"Id X 36"  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements ...
    MSRP: $20.61
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    Nordyne 632484R Flame Sensor

    Nordyne

    MSRP: $40.06
    Now: $30.96
    Nordyne 632484R Flame Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements   Cross...
    MSRP: $40.06
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    Nordyne 626491R Defrost Sensor

    Nordyne

    MSRP: $28.92
    Now: $22.35
    Nordyne 626491R Defrost Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $28.92
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    Nordyne 626488R Defrost Sensor L68-38F

    Nordyne

    MSRP: $36.60
    Now: $28.28
    Nordyne 626488R Defrost Sensor L68-38F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $36.60
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    Robertshaw EGT-08 Eaton Thermostat

    Robertshaw

    MSRP: $57.85
    Now: $43.83
    Robertshaw EGT-08 Eaton Thermostatl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements Cross...
    MSRP: $57.85
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    Robertshaw 9204V 24V 2 Wire 1 Heat Vert Thermostat

    Robertshaw

    MSRP: $35.90
    Now: $27.74
    Robertshaw 9204V 24V 2 Wire 1 Heat Vert Thermostatl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $35.90
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    Robertshaw 9204H 2 Wire 24V Horz, White 1 Heat

    Robertshaw

    MSRP: $35.90
    Now: $27.74
    Robertshaw 9204H 2 Wire 24V Horz, White 1 Heatl  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements ...
    MSRP: $35.90
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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.