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Thermostats / Sensors

Thermostats / Sensors

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    Armstrong Furnace R100503-08 Defrost Stat

    Armstrong Furnace

    MSRP: $109.20
    Now: $84.38
    Armstrong Furnace R100503-08 Defrost 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: $109.20
    Now: $84.38
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    Armstrong Furnace R42936-001 L250-110F DISCHARGE T-STAT

    Armstrong Furnace

    MSRP: $34.34
    Now: $26.53
    Armstrong Furnace R42936-001 L250-110F DISCHARGE 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: $34.34
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    Armstrong Furnace R40787-001 Outdoor Stat Kit

    Armstrong Furnace

    MSRP: $117.69
    Now: $90.95
    Armstrong Furnace R40787-001 Outdoor Stat Kit 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: $117.69
    Now: $90.95
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    Armstrong Furnace ASTAT503-1 Outdoor Thermostat

    Armstrong Furnace

    MSRP: $272.43
    Now: $210.52
    Armstrong Furnace ASTAT503-1 Outdoor 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: $272.43
    Now: $210.52
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    Armstrong Furnace 1.841226 COMFORT SYNC A3 WIFI STAT

    Armstrong Furnace

    MSRP: $1,293.01
    Now: $999.14
    Armstrong Furnace 1.841226 COMFORT SYNC A3 WIFI 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: $1,293.01
    Now: $999.14
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    Automation Components Inc (ACI) 102484 Freeze Stat 20' Cap M/R 2 SPDT

    Automation Components Inc (ACI)

    MSRP: $352.60
    Now: $272.47
    Automation Components Inc (ACI) 102484 Freeze Stat 20' Cap M/R 2 SPDT 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: $352.60
    Now: $272.47
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    Automation Components Inc (ACI) 102483 Freeze Stat 20' Cap A/R 1 SPDT

    Automation Components Inc (ACI)

    MSRP: $278.59
    Now: $215.27
    Automation Components Inc (ACI) 102483 Freeze Stat 20' Cap A/R 1 SPDT 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: $278.59
    Now: $215.27
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    Automation Components Inc (ACI) 102482 Freeze Stat 20' Cap M/R 1 SPDT

    Automation Components Inc (ACI)

    MSRP: $286.90
    Now: $221.70
    Automation Components Inc (ACI) 102482 Freeze Stat 20' Cap M/R 1 SPDT 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: $286.90
    Now: $221.70
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    Automation Components Inc (ACI) 145359 FreezeStat 20'Cap M/R 2Circuit

    Automation Components Inc (ACI)

    MSRP: $506.45
    Now: $391.35
    Automation Components Inc (ACI) 145359 FreezeStat 20'Cap M/R 2Circuit 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: $506.45
    Now: $391.35
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    Automation Components Inc (ACI) 145361 FreezeStat 50'Cap M/R 2Circuit

    Automation Components Inc (ACI)

    MSRP: $921.59
    Now: $712.14
    Automation Components Inc (ACI) 145361 FreezeStat 50'Cap M/R 2Circuit 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: $921.59
    Now: $712.14
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    Automation Components Inc (ACI) 142963 FreezeStat 50' Cap M/R 2 SPDT

    Automation Components Inc (ACI)

    MSRP: $749.89
    Now: $579.46
    Automation Components Inc (ACI) 142963 FreezeStat 50' Cap M/R 2 SPDT 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: $749.89
    Now: $579.46
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    Automation Components Inc (ACI) 145358 FreezeStat 20'Cap A/R 2Circuit

    Automation Components Inc (ACI)

    MSRP: $508.10
    Now: $392.62
    Automation Components Inc (ACI) 145358 FreezeStat 20'Cap A/R 2Circuit 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: $508.10
    Now: $392.62
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    MSRP: $508.10
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    Automation Components Inc (ACI) 122708 RH Out 0-5 0-10 VDC & 4-20mA

    Automation Components Inc (ACI)

    MSRP: $286.98
    Now: $221.76
    Automation Components Inc (ACI) 122708 RH Out 0-5 0-10 VDC & 4-20mA 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: $286.98
    Now: $221.76
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    Automation Components Inc (ACI) 145354 FreezeStat 6' Cap A/R 2Circuit

    Automation Components Inc (ACI)

    MSRP: $454.05
    Now: $350.85
    Automation Components Inc (ACI) 145354 FreezeStat 6' Cap A/R 2Circuit 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: $454.05
    Now: $350.85
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    MSRP: $454.05
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    Automation Components Inc (ACI) 106293 Freeze Stat 10' Cap M/R 2 SPDT

    Automation Components Inc (ACI)

    MSRP: $353.43
    Now: $273.10
    Automation Components Inc (ACI) 106293 Freeze Stat 10' Cap M/R 2 SPDT 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: $353.43
    Now: $273.10
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    Automation Components Inc (ACI) 105904 Freeze Stat 20' Cap A/R 2 SPDT

    Automation Components Inc (ACI)

    MSRP: $321.83
    Now: $248.69
    Automation Components Inc (ACI) 105904 Freeze Stat 20' Cap A/R 2 SPDT 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: $321.83
    Now: $248.69
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    Automation Components Inc (ACI) 106291 Freeze Stat 10' Cap M/R 1 SPDT

    Automation Components Inc (ACI)

    MSRP: $313.52
    Now: $242.26
    Automation Components Inc (ACI) 106291 Freeze Stat 10' Cap M/R 1 SPDT 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: $313.52
    Now: $242.26
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    Accustat PSG Controls RLV-120S 120v Non-Prog Digital Stat

    Accustat PSG Controls

    MSRP: $97.98
    Now: $75.71
    Accustat PSG Controls RLV-120S 120v Non-Prog Digital 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: $97.98
    Now: $75.71
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    Johnson Controls NSB8BTN340-0 Temp White Sensor/UserInterface

    Johnson Controls

    MSRP: $269.89
    Now: $208.55
    Johnson Controls NSB8BTN340-0 Temp White Sensor/UserInterface 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: $269.89
    Now: $208.55
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    Johnson Controls WRZ-TTP0000-2 Wireless Room Temp Sensor LED

    Johnson Controls

    MSRP: $301.65
    Now: $233.10
    Johnson Controls WRZ-TTP0000-2 Wireless Room Temp Sensor LED 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: $301.65
    Now: $233.10
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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.