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Thermostats / Sensors

Thermostats / Sensors

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    Lochinvar & A.O. Smith 100109908 (Replaces 9004520215) FLAME SENSOR

    Lochinvar & A.O. Smith

    MSRP: $94.89
    Now: $73.33
    Lochinvar & A.O. Smith 100109908 (Replaces 9004520215) FLAME SENSOR This is the updated version for 9004520215   FurnacePartSource.com Commitment Always Brand-New Genuine Parts In stock parts ship Same Business Day...
    MSRP: $94.89
    Now: $73.33
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    Rheem-Ruud 47-104184-01 Water Sensor

    Rheem-Ruud

    MSRP: $10.21
    Now: $7.89
    Rheem-Ruud 47-104184-01 Water Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $10.21
    Now: $7.89
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    Honeywell TH5220D1029 (Replaces TH5220D1003) FocusPro 5000 Digital Non Programmable Thermostat

    Resideo

    MSRP: $225.79
    Now: $174.47
    Honeywell TH5220D1029 (Replaces TH5220D1003) FocusPro 5000 Digital Non Programmable Thermostat (Larger Display) FocusPro 5000 Digital Non Programmable Thermostat, 20-30Vac or 750mV, Up to 2 Heat/2 Cool Conventional Systems and up to 2 Heat/1 Cool Heat...
    MSRP: $225.79
    Now: $174.47
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    Trane TCONT724AS42DA THERMOSTAT XL724

    Trane

    MSRP: $358.51
    Now: $277.03
    Trane TCONT724AS42DA THERMOSTAT XL724    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: $358.51
    Now: $277.03
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    Laars Heating Systems R2014800 Temperature Control Sensor

    Laars Heating Systems

    MSRP: $178.93
    Now: $138.26
    Laars Heating Systems R2014800 Temperature Control Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Every Time No Minimum Order Requirements
    MSRP: $178.93
    Now: $138.26
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    Carrier HH79NZ091 Outside Air Temp Sensor

    Carrier

    MSRP: $75.45
    Now: $58.31
    Carrier HH79NZ091 Outside Air Temp Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $75.45
    Now: $58.31
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    York S1-2702-311P Flame Sensor; 90 Degree Bend

    York

    MSRP: $42.03
    Now: $32.47
    York S1-2702-311P Flame Sensor; 90 Degree Bend   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $42.03
    Now: $32.47
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    System Sensor D4120 (Replaces 70-600000-054 & 70-600000-157) Gas/Smoke Detector

    System Sensor

    MSRP: $222.50
    Now: $171.93
    System Sensor D4120 (Replaces 70-600000-054) Gas/Smoke Detection, 24Vac/dc or 120Vac Power Supply, 4-Wire Photoelectric Low-Flow Duct Smoke Detector with two DPDT relay contacts and Test/Reset button This is the Direct Replacement for: ...
    MSRP: $222.50
    Now: $171.93
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    Rheem-Ruud AP19134 Rope Water Sensor

    Rheem-Ruud

    MSRP: $35.28
    Now: $27.26
    Rheem-Ruud AP19134 Rope Water Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $35.28
    Now: $27.26
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    Trane THT2473 High Temp Thermostat 240V SPST

    Trane

    MSRP: $154.08
    Now: $116.73
    Trane THT2473 High Temp Thermostat 240V SPST  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: $154.08
    Now: $116.73
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    Rheem-Ruud SP20748 Gas Control (Thermostat) - NG

    Rheem

    MSRP: $394.53
    Now: $298.89
    Rheem-Ruud SP20748 Gas Control (Thermostat) - NG   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements   Cross References  
    MSRP: $394.53
    Now: $298.89
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    Bard HVAC 8612-023B (replaces 8612-023A) OutdoorTempSensor 35'Leads

    Bard HVAC

    MSRP: $91.20
    Now: $70.47
    Bard HVAC 8612-023B OutdoorTempSensor 35'Leads This is the updated version for 8612-023A FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements  
    MSRP: $91.20
    Now: $70.47
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    Johnson Controls TEC3622-14-000 (Replaces TB7200F5014B & TEC2146-4) Thermostat

    Johnson Controls

    MSRP: $773.67
    Now: $597.83
    Johnson Controls TEC3622-14-000 (Replaces TB7200F5014B & TEC2146-4) Thermostat MSTP/N2 0-10VDC WHITE This is the Direct Replacement for TB7200F5014BThis is the Direct Replacement for TEC2146-4 FurnacePartSource.com...
    MSRP: $773.67
    Now: $597.83
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    Honeywell Analytics SPXCDXSPXSS XCD Propane Sensor

    Honeywell Analytics

    MSRP: $1,419.18
    Now: $1,075.14
    Honeywell Analytics SPXCDXSPXSS  XCD Propane Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $1,419.18
    Now: $1,075.14
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    Trane TCONT103AN21HA Heatpump Thermostat 2Ht/1Cl

    Trane

    MSRP: $113.97
    Now: $88.06
    Trane TCONT103AN21HA Heatpump Thermostat 2Ht/1Cl  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: $113.97
    Now: $88.06
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    Trane TCONT302AS42DA (Replaces TCONT800AS11AA) Programmable Thermostat 7day 4H/2H

    Trane

    MSRP: $277.15
    Now: $214.16
    Trane TCONT302AS42DA (Replaces TCONT800AS11AA) Programmable Thermostat 7 day 4H/2H This is the Direct Replacement for TCONT800AS11AA FurnacePartSource.com Commitment Always Brand-New Genuine Parts In stock parts...
    MSRP: $277.15
    Now: $214.16
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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.