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Thermostats / Sensors

Thermostats / Sensors

  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • Lochinvar & A.O. Smith 100274615 UpperT-STAT(all 2&3wire inter)

    Lochinvar & A.O. Smith

    MSRP: $58.56
    Now: $45.25
    Lochinvar & A.O. Smith 100274615 UpperT-STAT(all 2&3wire inter) 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: $58.56
    Now: $45.25
    Qty in Cart: 0
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    Price:
    MSRP: $58.56
    Now: $45.25
    Subtotal:
  • Lochinvar & A.O. Smith 100111304 LOWER THERMOSTAT W/ECO WH9C

    Lochinvar & A.O. Smith

    MSRP: $55.06
    Now: $42.55
    Lochinvar & A.O. Smith 100111304 LOWER THERMOSTAT W/ECO WH9C 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: $55.06
    Now: $42.55
    Qty in Cart: 0
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    Price:
    MSRP: $55.06
    Now: $42.55
    Subtotal:
  • Lochinvar & A.O. Smith 100274592 Lower T-stat

    Lochinvar & A.O. Smith

    MSRP: $46.55
    Now: $35.97
    Lochinvar & A.O. Smith 100274592 Lower T-stat 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: $46.55
    Now: $35.97
    Qty in Cart: 0
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    Price:
    MSRP: $46.55
    Now: $35.97
    Subtotal:
  • Lochinvar & A.O. Smith 100109825 THERMOSTAT

    Lochinvar & A.O. Smith

    MSRP: $33.00
    Now: $25.00
    Lochinvar & A.O. Smith 100109825 THERMOSTAT 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: $33.00
    Now: $25.00
    Qty in Cart: 0
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    MSRP: $33.00
    Now: $25.00
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  • Lochinvar & A.O. Smith 100276287 K GAS THERMOSTAT MFG-H CONV

    Lochinvar & A.O. Smith

    MSRP: $400.97
    Now: $309.84
    Lochinvar & A.O. Smith 100276287 K GAS THERMOSTAT MFG-H CONV 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: $400.97
    Now: $309.84
    Qty in Cart: 0
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    Price:
    MSRP: $400.97
    Now: $309.84
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  • Lochinvar & A.O. Smith 100108642 ELECTRIC THERMOSTAT W/COVER

    Lochinvar & A.O. Smith

    MSRP: $34.65
    Now: $26.25
    Lochinvar & A.O. Smith 100108642 ELECTRIC THERMOSTAT W/COVER 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: $34.65
    Now: $26.25
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $34.65
    Now: $26.25
    Subtotal:
  • Lochinvar & A.O. Smith 100075721 TSTAT BOARD

    Lochinvar & A.O. Smith

    MSRP: $226.61
    Now: $175.11
    Lochinvar & A.O. Smith 100075721 TSTAT BOARD 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: $226.61
    Now: $175.11
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $226.61
    Now: $175.11
    Subtotal:
  • Lochinvar & A.O. Smith 100108641 THERMOSTAT W/ECO & COVER

    Lochinvar & A.O. Smith

    MSRP: $72.07
    Now: $55.69
    Lochinvar & A.O. Smith 100108641 THERMOSTAT W/ECO & COVER 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: $72.07
    Now: $55.69
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $72.07
    Now: $55.69
    Subtotal:
  • Lochinvar & A.O. Smith 100093749 K TSTAT 1.5"SHANK FG 42.75K LP

    Lochinvar & A.O. Smith

    MSRP: $365.29
    Now: $282.27
    Lochinvar & A.O. Smith 100093749 K TSTAT 1.5"SHANK FG 42.75K LP 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: $365.29
    Now: $282.27
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $365.29
    Now: $282.27
    Subtotal:
  • Lochinvar & A.O. Smith 100108684 UP THERMOSTAT W/ECO & COVER

    Lochinvar & A.O. Smith

    MSRP: $33.46
    Now: $25.86
    Lochinvar & A.O. Smith 100108684 UP THERMOSTAT W/ECO & COVER 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: $33.46
    Now: $25.86
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $33.46
    Now: $25.86
    Subtotal:
  • Lochinvar & A.O. Smith 100309396 THERMOSTAT PCB ASSY UNIVERSAL

    Lochinvar & A.O. Smith

    MSRP: $285.85
    Now: $220.88
    Lochinvar & A.O. Smith 100309396 THERMOSTAT PCB ASSY UNIVERSAL 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: $285.85
    Now: $220.88
    Qty in Cart: 0
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    Price:
    MSRP: $285.85
    Now: $220.88
    Subtotal:
  • Lochinvar & A.O. Smith 100108421 LOWER THERMOSTAT W/COVER WH9

    Lochinvar & A.O. Smith

    MSRP: $25.74
    Now: $19.89
    Lochinvar & A.O. Smith 100108421 LOWER THERMOSTAT W/COVER WH9 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: $25.74
    Now: $19.89
    Qty in Cart: 0
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    Price:
    MSRP: $25.74
    Now: $19.89
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  • Lochinvar & A.O. Smith 100108951 UPPER THERMOSTAT W/ECO & COVER

    Lochinvar & A.O. Smith

    MSRP: $73.80
    Now: $57.03
    Lochinvar & A.O. Smith 100108951 UPPER THERMOSTAT W/ECO & COVER 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: $73.80
    Now: $57.03
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $73.80
    Now: $57.03
    Subtotal:
  • Lochinvar & A.O. Smith 100112570 THERMOSTAT

    Lochinvar & A.O. Smith

    MSRP: $49.20
    Now: $38.02
    Lochinvar & A.O. Smith 100112570 THERMOSTAT 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: $49.20
    Now: $38.02
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $49.20
    Now: $38.02
    Subtotal:
  • Lochinvar & A.O. Smith 100108424 LOWER THERMOSTAT W/COVER WH9-6

    Lochinvar & A.O. Smith

    MSRP: $36.04
    Now: $27.85
    Lochinvar & A.O. Smith 100108424 LOWER THERMOSTAT W/COVER WH9-6 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: $36.04
    Now: $27.85
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $36.04
    Now: $27.85
    Subtotal:
  • Lochinvar & A.O. Smith 100233264 BULBWELL FOR THERMOSTAT

    Lochinvar & A.O. Smith

    MSRP: $54.05
    Now: $41.77
    Lochinvar & A.O. Smith 100233264 BULBWELL FOR THERMOSTAT 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: $54.05
    Now: $41.77
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $54.05
    Now: $41.77
    Subtotal:
  • Liebert E-3080S THERMOSTAT 20/90F SPDT NO CVR

    Liebert

    MSRP: $240.67
    Now: $185.97
    Liebert E-3080S THERMOSTAT 20/90F SPDT NO CVR 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: $240.67
    Now: $185.97
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $240.67
    Now: $185.97
    Subtotal:
  • Lennox 17A30 iHARMONY ZONE THERMOSTAT

    Lennox

    MSRP: $730.82
    Now: $564.72
    Lennox 17A30 iHARMONY ZONE THERMOSTAT 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: $730.82
    Now: $564.72
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $730.82
    Now: $564.72
    Subtotal:
  • Lennox 78M26 THERMOSTAT SPST CLOSE 74F

    Lennox

    MSRP: $82.76
    Now: $63.95
    Lennox 78M26 THERMOSTAT SPST CLOSE 74F 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: $82.76
    Now: $63.95
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $82.76
    Now: $63.95
    Subtotal:
  • Lennox 56M62 Thermostat Open70F Close50F

    Lennox

    MSRP: $40.71
    Now: $31.45
    Lennox 56M62 Thermostat Open70F Close50F 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: $40.71
    Now: $31.45
    Qty in Cart: 0
    Quantity:
    Price:
    MSRP: $40.71
    Now: $31.45
    Subtotal:
  • Total: items /

Adding your products to cart

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.