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Thermostats / Sensors

Thermostats / Sensors

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    MARS 33475 Thermostats Op40 Cl20

    MARS

    MSRP: $119.34
    Now: $92.22
    MARS 33475 Thermostats Op40 Cl20 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: $119.34
    Now: $92.22
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    MARS 33430 Open50 Close35 RefrigTstat

    MARS

    MSRP: $103.64
    Now: $80.08
    MARS 33430 Open50 Close35 RefrigTstat 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: $103.64
    Now: $80.08
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    Daikin-McQuay 250803400 RTU BACNET THERMOSTAT

    DAIKIN APPLIED

    MSRP: $1,486.06
    Now: $1,148.32
    Daikin-McQuay 250803400 RTU BACNET 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: $1,486.06
    Now: $1,148.32
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    Daikin-McQuay DTST-ONE-ADA-A ONE+ SMART THERMOSTAT

    Daikin-McQuay

    MSRP: $859.27
    Now: $663.98
    Daikin-McQuay DTST-ONE-ADA-A ONE+ SMART 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: $859.27
    Now: $663.98
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    Daikin-McQuay 073394101 Manual C/O Thermostat

    DAIKIN APPLIED

    MSRP: $182.49
    Now: $141.01
    Daikin-McQuay 073394101 Manual C/O 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: $182.49
    Now: $141.01
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    Daikin-McQuay 107345204 50/90f 24-277V Thermostat

    DAIKIN APPLIED

    MSRP: $328.88
    Now: $254.13
    Daikin-McQuay 107345204 50/90f 24-277V 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: $328.88
    Now: $254.13
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    Daikin-McQuay 802005724 TSTAT 28-OUT/38-IN 55DEG-MAX

    DAIKIN APPLIED

    MSRP: $132.25
    Now: $102.19
    Daikin-McQuay 802005724 TSTAT 28-OUT/38-IN 55DEG-MAX 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: $132.25
    Now: $102.19
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    Daikin-McQuay 018482800 Htg/Clg Auto C/O UnitMtd Stat

    DAIKIN APPLIED

    MSRP: $162.24
    Now: $125.37
    Daikin-McQuay 018482800 Htg/Clg Auto C/O UnitMtd 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: $162.24
    Now: $125.37
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    Daikin-McQuay 910121754 TSTAT,ROOM DIGITAL ADJ TMP & H

    DAIKIN APPLIED

    MSRP: $550.90
    Now: $425.70
    Daikin-McQuay 910121754 TSTAT,ROOM DIGITAL ADJ TMP & H 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: $550.90
    Now: $425.70
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    Daikin-McQuay 910417944 WIF1 2 HEAT 2 COOL TSTAT

    DAIKIN APPLIED

    MSRP: $404.70
    Now: $312.72
    Daikin-McQuay 910417944 WIF1 2 HEAT 2 COOL TSTAT 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: $404.70
    Now: $312.72
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    Daikin-McQuay 062278701 1 Stage Limit-Bulb Tstat

    DAIKIN APPLIED

    MSRP: $196.14
    Now: $151.56
    Daikin-McQuay 062278701 1 Stage Limit-Bulb Tstat 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: $196.14
    Now: $151.56
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    Daikin-McQuay 300056536 Tstat 2H/2C NonProg AutoCO

    DAIKIN APPLIED

    MSRP: $320.15
    Now: $247.39
    Daikin-McQuay 300056536 Tstat 2H/2C NonProg AutoCO 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: $320.15
    Now: $247.39
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    Daikin-McQuay 017606800 55/90f 115V SPDT Unit Mtd Stat

    DAIKIN APPLIED

    MSRP: $243.09
    Now: $187.85
    Daikin-McQuay 017606800 55/90f 115V SPDT Unit Mtd 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: $243.09
    Now: $187.85
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    Daikin-McQuay 044275100 55/90f 120V SPDT Thermostat

    DAIKIN APPLIED

    MSRP: $130.22
    Now: $100.62
    Daikin-McQuay 044275100 55/90f 120V SPDT 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: $130.22
    Now: $100.62
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    MSRP: $130.22
    Now: $100.62
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    Markel Products Co. RK120EAA WALL THERMOSTAT

    Markel Products Co.

    MSRP: $42.64
    Now: $32.95
    Markel Products Co. RK120EAA WALL 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: $42.64
    Now: $32.95
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    Markel Products Co. ETD9STS T-STAT,LINE VOLTAGE,HEAT/COOL

    Markel Products Co.

    MSRP: $61.71
    Now: $47.68
    Markel Products Co. ETD9STS T-STAT,LINE VOLTAGE,HEAT/COOL 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: $61.71
    Now: $47.68
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    Markel Products Co. 60048010C Single Pole Thermostat

    Markel Products Co.

    MSRP: $255.72
    Now: $197.60
    Markel Products Co. 60048010C 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: $255.72
    Now: $197.60
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    Markel Products Co. 63818003 THERMOSTAT KNOB

    Markel Products Co.

    MSRP: $19.93
    Now: $15.40
    Markel Products Co. 63818003 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: $19.93
    Now: $15.40
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    Markel Products Co. 59113001 DPST Thermostat

    Markel Products Co.

    MSRP: $455.30
    Now: $351.82
    Markel Products Co. 59113001 DPST 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: $455.30
    Now: $351.82
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    MSRP: $455.30
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    Markel Products Co. ETD9MTS 2 STAGE HEAT/COOL 120V STAT

    Markel Products Co.

    MSRP: $71.81
    Now: $55.49
    Markel Products Co. ETD9MTS 2 STAGE HEAT/COOL 120V 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: $71.81
    Now: $55.49
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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.