null

Thermostats / Sensors

Thermostats / Sensors

  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 7MF15654CB105EA1 Sensor, Liquid/Gas, 0-10V, 0-200#

    Siemens Building Technology

    MSRP: $422.96
    Now: $326.83
    Siemens 7MF15654CB105EA1 Sensor, Liquid/Gas, 0-10V, 0-200#  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $422.96
    Now: $326.83
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $422.96
    Now: $326.83
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 7MF15654CA105EA1 Liq/Gas Pressens 0-10Vdc, 0-150

    Siemens Building Technology

    MSRP: $422.96
    Now: $326.83
    Siemens 7MF15654CA105EA1 Liq/Gas Pressens 0-10Vdc, 0-150   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $422.96
    Now: $326.83
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $422.96
    Now: $326.83
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 7MF15654BG005EA1 Liquid/Gas Sensor, 4-20Ma, 0-100Psi

    Siemens Building Technology

    MSRP: $422.96
    Now: $326.83
    Siemens 7MF15654BG005EA1 Liquid/Gas Sensor, 4-20Ma, 0-100Psi  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $422.96
    Now: $326.83
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $422.96
    Now: $326.83
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 7MF15654BF105EA1 Sensor, Liquid/Gas, 0-10V, 0-60#

    Siemens

    MSRP: $366.10
    Now: $277.35
    Siemens 7MF15654BF105EA1 Sensor, Liquid/Gas, 0-10V, 0-60#  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $366.10
    Now: $277.35
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $366.10
    Now: $277.35
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 7MF15654BE005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-30#

    Siemens Building Technology

    MSRP: $422.96
    Now: $326.83
    Siemens 7MF15654BE005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-30#  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $422.96
    Now: $326.83
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $422.96
    Now: $326.83
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 7MF15654BB105EA1 Lquid/Gas Sensor, 0-10Vdc, 0-15#

    Siemens Building Technology

    MSRP: $422.96
    Now: $326.83
    Siemens 7MF15654BB105EA1 Lquid/Gas Sensor, 0-10Vdc, 0-15#  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $422.96
    Now: $326.83
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $422.96
    Now: $326.83
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 7MF15654BB005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-15#

    Siemens Building Technology

    MSRP: $422.96
    Now: $326.83
    Siemens 7MF15654BB005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-15#  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $422.96
    Now: $326.83
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $422.96
    Now: $326.83
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-578 Temp Sensor O/Air -40/240F

    Siemens Building Technology

    MSRP: $63.44
    Now: $49.02
    Siemens 544-578 Temp Sensor O/Air -40/240F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $63.44
    Now: $49.02
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $63.44
    Now: $49.02
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-577-40 -40/240F Immersion Avg Sensor

    Siemens Building Technology

    MSRP: $123.96
    Now: $95.79
    Siemens 544-577-40 -40/240F Immersion Avg Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $123.96
    Now: $95.79
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $123.96
    Now: $95.79
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-577-25 Imm Sensor -40/240 1000Ohm Plat

    Siemens Building Technology

    MSRP: $118.55
    Now: $91.61
    Siemens 544-577-25 Imm Sensor -40/240 1000Ohm Plat  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $118.55
    Now: $91.61
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $118.55
    Now: $91.61
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-562-40 4" 32/212F Immersion Sensor

    Siemens

    MSRP: $139.67
    Now: $105.81
    Siemens 544-562-40 4" 32/212F Immersion Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $139.67
    Now: $105.81
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $139.67
    Now: $105.81
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-483A Temp Sensor Repair Kit

    Siemens

    MSRP: $58.00
    Now: $43.94
    Siemens 544-483A Temp Sensor Repair Kit  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $58.00
    Now: $43.94
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $58.00
    Now: $43.94
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-343-24 D/Av Sensor, 24"Prb, Rtd, 20-120F

    Siemens Building Technology

    MSRP: $130.28
    Now: $100.67
    Siemens 544-343-24 D/Av Sensor, 24"Prb, Rtd, 20-120F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $130.28
    Now: $100.67
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $130.28
    Now: $100.67
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-343-18 Rigid Avg Sensor Pt 1K Ohm 18" Probe

    Siemens Building Technology

    MSRP: $122.23
    Now: $94.45
    Siemens 544-343-18 Rigid Avg Sensor Pt 1K Ohm 18" Probe   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $122.23
    Now: $94.45
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $122.23
    Now: $94.45
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-339-18 D/Pt Temp. Sensor, Rtd, -40/240F

    Siemens Building Technology

    MSRP: $61.74
    Now: $47.71
    Siemens 544-339-18 D/Pt Temp. Sensor, Rtd, -40/240F  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $61.74
    Now: $47.71
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $61.74
    Now: $47.71
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 544-089 Surface Mount Pipe Sensor

    Siemens

    MSRP: $59.32
    Now: $44.94
    Siemens 544-089 Surface Mount Pipe Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $59.32
    Now: $44.94
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $59.32
    Now: $44.94
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 540-995 10K Ohm (Apogee Tec) Ntc Thermst

    Siemens Building Technology

    MSRP: $52.12
    Now: $40.28
    Siemens 540-995 10K Ohm (Apogee Tec) Ntc Thermst  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $52.12
    Now: $40.28
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $52.12
    Now: $40.28
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 540-680CB White Temp Sen W/Set Pt & O/R Cel

    Siemens Building Technology

    MSRP: $247.48
    Now: $187.49
    Siemens 540-680CB White Temp Sen W/Set Pt & O/R Cel  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $247.48
    Now: $187.49
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $247.48
    Now: $187.49
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 540-680CA Beige Temp Sen W/Set Pt & O/R Cel

    Siemens

    MSRP: $708.71
    Now: $536.90
    Siemens 540-680CA Beige Temp Sen W/Set Pt & O/R Cel  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $708.71
    Now: $536.90
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $708.71
    Now: $536.90
    Subtotal:
    Add to Cart
  • Furnace part souls images
    Add to Cart
    Quick view

    Siemens 540-670B Tec Room Sensor, W/Stpt, Ovride

    Siemens Building Technology

    MSRP: $628.32
    Now: $485.52
    Siemens 540-670B Tec Room Sensor, W/Stpt, Ovride   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $628.32
    Now: $485.52
    Add to Cart Quick view
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $628.32
    Now: $485.52
    Subtotal:
    Add to Cart
  • Total: items /

Adding your products to cart

View Cart Continue Shopping

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.