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Thermostats / Sensors

Thermostats / Sensors

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    Siemens QAH11.1 Changeover / Remote Sensor

    Siemens Building Technology

    MSRP: $18.76
    Now: $14.50
    Siemens QAH11.1 Changeover / Remote Sensor  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $18.76
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    Siemens QAE2030.005 Imm Temp Ntc Snr, 10K Ohm, Ty2,2.5"

    Siemens Building Technology

    MSRP: $77.50
    Now: $59.89
    Siemens QAE2030.005 Imm Temp Ntc Snr, 10K Ohm, Ty2,2.5"  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $77.50
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    Siemens QAE2020.005 Imm Well Sensor Ni 1000 Ohm, 2.5"

    Siemens Building Technology

    MSRP: $96.87
    Now: $74.86
    Siemens QAE2020.005 Imm Well Sensor Ni 1000 Ohm, 2.5"  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $96.87
    Now: $74.86
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    Siemens QAE2012.015 Imrsn Temp Plat Sensor, 1000 Ohm, 6"Pr

    Siemens Building Technology

    MSRP: $97.94
    Now: $75.68
    Siemens QAE2012.015 Imrsn Temp Plat Sensor, 1000 Ohm, 6"Pr  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $97.94
    Now: $75.68
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    Siemens QAE2012.010 Imrsn Temp Plat Sensor, 1000 Ohm, 4"

    Siemens Building Technology

    MSRP: $93.24
    Now: $72.05
    Siemens QAE2012.010 Imrsn Temp Plat Sensor, 1000 Ohm, 4"   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $93.24
    Now: $72.05
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    Siemens QAE2012.005 Imrsn Temp Plat Sensor, 1000 Ohm, 2.5"

    Siemens Building Technology

    MSRP: $89.23
    Now: $68.95
    Siemens QAE2012.005 Imrsn Temp Plat Sensor, 1000 Ohm, 2.5"  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $89.23
    Now: $68.95
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    Siemens QAD2030U Pipe Strap-On Ntc Temp Sensor, 10K Ohm

    Siemens Building Technology

    MSRP: $72.48
    Now: $56.01
    Siemens QAD2030U Pipe Strap-On Ntc Temp Sensor, 10K Ohm  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $72.48
    Now: $56.01
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    Siemens QAD2012U Pipe Strap-Ontemp Plat Sensor, 1K

    Siemens Building Technology

    MSRP: $89.92
    Now: $69.49
    Siemens QAD2012U Pipe Strap-Ontemp Plat Sensor, 1K  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $89.92
    Now: $69.49
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    Siemens QAC2030U Outdr Ntc Temp Sensor, 10K Ohm,Typ2

    Siemens Building Technology

    MSRP: $60.60
    Now: $46.83
    Siemens QAC2030U Outdr Ntc Temp Sensor, 10K Ohm,Typ2  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $60.60
    Now: $46.83
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    Siemens QAC2012U Outdr Plat Temp Sensor, 1000 Ohm

    Siemens Building Technology

    MSRP: $70.47
    Now: $54.46
    Siemens QAC2012U Outdr Plat Temp Sensor, 1000 Ohm  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $70.47
    Now: $54.46
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    Siemens QAA22SS.EWSN 55/95F Rm Sensor; 0-5V/10V/4-20Ma

    Siemens Building Technology

    MSRP: $155.36
    Now: $120.05
    Siemens QAA22SS.EWSN 55/95F Rm Sensor; 0-5V/10V/4-20Ma  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $155.36
    Now: $120.05
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    Siemens ARG70 T'Thermostat Wall Plate Escutcheon

    Siemens Building Technology

    MSRP: $13.86
    Now: $10.71
    Siemens ARG70 T'Thermostat Wall Plate Escutcheon  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $13.86
    Now: $10.71
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    Siemens AQF3100 Sunshield For Qfa Sensor

    Siemens Building Technology

    MSRP: $39.12
    Now: $30.23
    Siemens AQF3100 Sunshield For Qfa Sensor   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $39.12
    Now: $30.23
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    Siemens 856-044 Thermostat Cover Vor Th832

    Siemens Building Technology

    MSRP: $123.35
    Now: $95.32
    Siemens 856-044 Thermostat Cover Vor Th832  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $123.35
    Now: $95.32
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    Siemens 833-033 Friction Knob For 832 Thermostats

    Siemens Building Technology

    MSRP: $39.58
    Now: $30.59
    Siemens 833-033 Friction Knob For 832 Thermostats  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements...
    MSRP: $39.58
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    Siemens 832-177 Pneumatic Thermostat Calibration Kit

    Siemens Building Technology

    MSRP: $453.50
    Now: $350.43
    Siemens 832-177 Pneumatic Thermostat Calibration Kit   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $453.50
    Now: $350.43
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    Siemens 832-0500 Drm Thermostat, Da, Key Adj W/Therm

    Siemens Building Technology

    MSRP: $498.94
    Now: $385.55
    Siemens 832-0500 Drm Thermostat, Da, Key Adj W/Therm   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $498.94
    Now: $385.55
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    Siemens 832-0490 Room Thermostat Conceal Adj, No Thrm

    Siemens

    MSRP: $455.27
    Now: $344.90
    Siemens 832-0490 Room Thermostat Conceal Adj, No Thrm  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $455.27
    Now: $344.90
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    Siemens 832-0120 Dstat Da, Concealed Adj W/Thm

    Siemens Building Technology

    MSRP: $557.01
    Now: $430.41
    Siemens 832-0120 Dstat Da, Concealed Adj W/Thm  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $557.01
    Now: $430.41
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    Siemens 7MF15654CD005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-300

    Siemens Building Technology

    MSRP: $444.10
    Now: $343.17
    Siemens 7MF15654CD005EA1 Sensor, Liquid/Gas, 4-20Ma, 0-300  FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $444.10
    Now: $343.17
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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.