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Thermostats / Sensors

Thermostats / Sensors

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    Marley Engineered Products MD26 DPST Stat 22amps 120-240V

    Marley Engineered Products

    MSRP: $51.56
    Now: $39.84
    Marley Engineered Products MD26 DPST Stat 22amps 120-240V 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: $51.56
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    Marley Engineered Products M611W 120/240V SPST THERMOSTAT

    Marley Engineered Products

    MSRP: $89.38
    Now: $69.07
    Marley Engineered Products M611W 120/240V SPST 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: $89.38
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    Marley Engineered Products 3301-11014-001 Thermostat Knob

    Marley Engineered Products

    MSRP: $5.12
    Now: $3.95
    Marley Engineered Products 3301-11014-001 Thermostat Knob 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: $5.12
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    Marley Engineered Products EFFT2 Unit mounted thermostat 2Pole

    Marley Engineered Products

    MSRP: $100.47
    Now: $77.63
    Marley Engineered Products EFFT2 Unit mounted thermostat 2Pole 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: $100.47
    Now: $77.63
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    Marley Engineered Products M602W 45/75f 2P Wall Mnt Thermostat

    Marley Engineered Products

    MSRP: $55.85
    Now: $43.16
    Marley Engineered Products M602W 45/75f 2P Wall Mnt 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: $55.85
    Now: $43.16
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    Marley Engineered Products M601W 45/75f 1P Wall Mnt Thermostat

    Marley Engineered Products

    MSRP: $47.26
    Now: $36.52
    Marley Engineered Products M601W 45/75f 1P Wall Mnt 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: $47.26
    Now: $36.52
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    Marley Engineered Products M600S 50/80f Line Voltage Thermostat

    Marley Engineered Products

    MSRP: $142.64
    Now: $110.22
    Marley Engineered Products M600S 50/80f Line Voltage 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: $142.64
    Now: $110.22
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    Marley Engineered Products TA2AWCA Double Pole Stat 22A 120-277V

    Marley Engineered Products

    MSRP: $65.37
    Now: $50.52
    Marley Engineered Products TA2AWCA Double Pole Stat 22A 120-277V 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: $65.37
    Now: $50.52
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    Marley Engineered Products 5813-2018-000 Thermostat

    Marley Engineered Products

    MSRP: $160.78
    Now: $124.24
    Marley Engineered Products 5813-2018-000 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: $160.78
    Now: $124.24
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    Marley Engineered Products M600MTP 2STAGE 22AMP LINE VOLTAGE STAT

    Marley Engineered Products

    MSRP: $142.64
    Now: $110.22
    Marley Engineered Products M600MTP 2STAGE 22AMP LINE VOLTAGE 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...
    MSRP: $142.64
    Now: $110.22
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    Marley Engineered Products TA1AWCA Single Pole stat 22A 120-277V

    Marley Engineered Products

    MSRP: $118.17
    Now: $91.32
    Marley Engineered Products TA1AWCA Single Pole stat 22A 120-277V 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: $118.17
    Now: $91.32
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    Marley Engineered Products MS26 SPST Stat 22amps 120-240V

    Marley Engineered Products

    MSRP: $47.26
    Now: $36.52
    Marley Engineered Products MS26 SPST Stat 22amps 120-240V 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: $47.26
    Now: $36.52
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    Marley Engineered Products M612W DPST Snap Action Thermostat

    Marley Engineered Products

    MSRP: $117.71
    Now: $90.96
    Marley Engineered Products M612W DPST Snap Action 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: $117.71
    Now: $90.96
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    Marley Engineered Products CDFT Single Pole Thermostat

    Marley Engineered Products

    MSRP: $179.67
    Now: $138.83
    Marley Engineered Products CDFT Single Pole 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: $179.67
    Now: $138.83
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    Marley Engineered Products 410130001 Thermostat T.O.D

    Marley Engineered Products

    MSRP: $153.38
    Now: $118.52
    Marley Engineered Products 410130001 Thermostat T.O.D 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: $153.38
    Now: $118.52
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    Marley Engineered Products 42521-032-08 Thermostat Knob Navaho White

    Marley Engineered Products

    MSRP: $3.28
    Now: $2.54
    Marley Engineered Products 42521-032-08 Thermostat Knob Navaho White 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...
    MSRP: $3.28
    Now: $2.54
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    Marley Engineered Products WT12A DPST Stat 22amps 120-240V

    Marley Engineered Products

    MSRP: $392.73
    Now: $303.48
    Marley Engineered Products WT12A DPST Stat 22amps 120-240V 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: $392.73
    Now: $303.48
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    Marley Engineered Products WT11A SPST Stat 22amps 120-240V

    Marley Engineered Products

    MSRP: $269.92
    Now: $208.58
    Marley Engineered Products WT11A SPST Stat 22amps 120-240V 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: $269.92
    Now: $208.58
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    BAPI BA/BG2 Smaller Thermostat Protector

    BAPI

    MSRP: $27.27
    Now: $21.08
    BAPI BA/BG2 Smaller Thermostat Protector 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: $27.27
    Now: $21.08
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    Marley Engineered Products EFFT1 Single Pole Thermostat 40/90f

    Marley Engineered Products

    MSRP: $86.11
    Now: $66.54
    Marley Engineered Products EFFT1 Single Pole Thermostat 40/90f 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: $86.11
    Now: $66.54
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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.