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Thermostats / Sensors

Thermostats / Sensors

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    Siemens 535-741-8 Duct P/T Sens 100Kohm 8" Probe

    Siemens

    MSRP: $43.74
    Now: $33.14
    Siemens 535-741-8 Duct P/T Sens 100Kohm 8" Probe  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $43.74
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    Siemens 535-741-18 Duct P/T Sens 100Kohm 18" Probe

    Siemens Building Technology

    MSRP: $51.43
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    MSRP: $51.43
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    Siemens 535-490-24 20-120F 24" Rigid Averaging Sens

    Siemens

    MSRP: $131.47
    Now: $99.60
    Siemens 535-490-24 20-120F 24" Rigid Averaging Sens  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $131.47
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    Siemens 535-490-18 18" Plat Rigid Sensor, 20-120F

    Siemens Building Technology

    MSRP: $146.52
    Now: $113.22
    Siemens 535-490-18 18" Plat Rigid Sensor, 20-120F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $146.52
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    Siemens 533-380-24 Temp Sens 20-120F 24' Probe

    Siemens Building Technology

    MSRP: $228.54
    Now: $176.60
    Siemens 533-380-24 Temp Sens 20-120F 24' Probe  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $228.54
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    Siemens 533-380-16 Temp Sensor, 20-120F 16' Flex Cap

    Siemens Building Technology

    MSRP: $212.31
    Now: $164.05
    Siemens 533-380-16 Temp Sensor, 20-120F 16' Flex Cap  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $212.31
    Now: $164.05
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    Siemens 533-376-8 Temp Sensor 20-120F, 8" Probe

    Siemens Building Technology

    MSRP: $124.23
    Now: $95.99
    Siemens 533-376-8 Temp Sensor 20-120F, 8" Probe  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $124.23
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    Siemens 533-376-18 Temp Sensor 20-120F, 18" Probe

    Siemens Building Technology

    MSRP: $129.95
    Now: $100.42
    Siemens 533-376-18 Temp Sensor 20-120F, 18" Probe  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $129.95
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    Siemens 357-0004 Lim Thermostat, 40' Cap. 35-145F

    Siemens Building Technology

    MSRP: $752.90
    Now: $581.78
    Siemens 357-0004 Lim Thermostat, 40' Cap. 35-145F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $752.90
    Now: $581.78
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    Siemens 194-2042 P' Star Thermostat, D/N, D/A, D/A, Hn Replacement

    Siemens

    MSRP: $298.22
    Now: $225.93
    Siemens 194-2042 P' Star Thermostat, D/N, D/A, D/A, Hn Replacement  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum...
    MSRP: $298.22
    Now: $225.93
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    Siemens 193-218 2-Pipe Ra Heat/Cl Thermostat, Feb

    Siemens Building Technology

    MSRP: $277.12
    Now: $214.14
    Siemens 193-218 2-Pipe Ra Heat/Cl Thermostat, Feb  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $277.12
    Now: $214.14
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    Siemens 193-216 Powers Feb Thermostat, Heat-Cl, Da/Ra

    Siemens Building Technology

    MSRP: $277.12
    Now: $214.14
    Siemens 193-216 Powers Feb Thermostat, Heat-Cl, Da/Ra  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $277.12
    Now: $214.14
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    Siemens 193-212 H/C Thermostat Da/Ra, Free Energy Band

    Siemens

    MSRP: $230.77
    Now: $174.83
    Siemens 193-212 H/C Thermostat Da/Ra, Free Energy Band  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $230.77
    Now: $174.83
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    Siemens 192-321 Thermostat Acc Restric. Plate (10Pak)

    Siemens

    MSRP: $94.02
    Now: $71.23
    Siemens 192-321 Thermostat Acc Restric. Plate (10Pak)  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $94.02
    Now: $71.23
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    Siemens 192-307 Adapter Base To Cover For Thermostat

    Siemens Building Technology

    MSRP: $8.66
    Now: $6.69
    Siemens 192-307 Adapter Base To Cover For Thermostat  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $8.66
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    Siemens 192-3044 Retrostat D/N Da Powers F Deg

    Siemens Building Technology

    MSRP: $380.69
    Now: $294.17
    Siemens 192-3044 Retrostat D/N Da Powers F Deg  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $380.69
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    Siemens 192-300W Thermostat Acc Universal Adapt Plt White

    Siemens Building Technology

    MSRP: $67.06
    Now: $51.82
    Siemens 192-300W Thermostat Acc Universal Adapt Plt White  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $67.06
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    Siemens 192-271 Thermostat Cover Key Exp/ Exp Logo

    Siemens Building Technology

    MSRP: $24.26
    Now: $18.74
    Siemens 192-271 Thermostat Cover Key Exp/ Exp Logo  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $24.26
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    Siemens 192-270 Thermostat Cover Key Exp/ Exp Logo

    Siemens Building Technology

    MSRP: $24.26
    Now: $18.74
    Siemens 192-270 Thermostat Cover Key Exp/ Exp Logo  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $24.26
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    Siemens 192-266 Thermostat Cover Key/ Exp/ Exp Logo

    Siemens Building Technology

    MSRP: $23.23
    Now: $17.95
    Siemens 192-266 Thermostat Cover Key/ Exp/ Exp Logo  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $23.23
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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.