Furnace & HVAC

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Marathon Motors G145 3HP 1725 208/230/460V MOTOR

Regal Rexnord - Marathon

MSRP: $769.43

Now: $594.56

Marathon Motors G145 3HP 1725 208/230/460V MOTOR FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

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Marathon Motors D149 1/2HP 115V 1725RPM 56 Motor

Regal Rexnord - Marathon

MSRP: $473.88

Now: $366.18

Marathon Motors D149 1/2HP 115V 1725RPM 56 Motor FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $473.88

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Marathon Motors B1502 1/4hp 1750rpm 120v 48fr Motor

Marathon Motors

MSRP: $295.04

Now: $223.51

Marathon Motors B1502 1/4hp 1750rpm 120v 48fr Motor FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $295.04

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Marathon Motors 4406 115v 1/3hp 1725rpm 48Y 5.6a

Aprilaire

MSRP: $22.75

Now: $17.58

Marathon Motors 4406 115v 1/3hp 1725rpm 48Y 5.6a FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $22.75

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Marathon Motors 4309 1/3hp 230v1ph 1725rpm 48fr DP

Marathon Motors

MSRP: $489.82

Now: $371.08

Marathon Motors 4309 1/3hp 230v1ph 1725rpm 48fr DP FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements

MSRP: $489.82

Now: $371.08

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Marathon Motors X509 2HP 208-230/460V 1140RPM Motor

Regal Rexnord - Marathon

MSRP: $670.08

Now: $517.79

Marathon Motors X509 2HP 208-230/460V 1140RPM Motor FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $670.08

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Marathon Motors O214 3/4HP 115/208-230V 3450RPM Mtr

Regal Rexnord - Marathon

MSRP: $351.50

Now: $271.61

Marathon Motors O214 3/4HP 115/208-230V 3450RPM Mtr FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $351.50

Now: $271.61

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Marathon Motors K1418 2HP 1800RPM 208-230/460V 3PH

Regal Rexnord - Marathon

MSRP: $713.28

Now: $551.17

Marathon Motors K1418 2HP 1800RPM 208-230/460V 3PH FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $713.28

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Marathon Motors G142 1HP 208-230/460V 1800RPM Motor

Regal Rexnord - Marathon

MSRP: $776.61

Now: $600.10

Marathon Motors G142 1HP 208-230/460V 1800RPM Motor FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $776.61

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Marathon Motors D107 1/6hp 115v 1725rpm 48 BlwMtr

Regal Rexnord - Marathon

MSRP: $248.69

Now: $192.17

Marathon Motors D107 1/6hp 115v 1725rpm 48 BlwMtr FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $248.69

Now: $192.17

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Marathon Motors C334 1HP 115/230V 3450RPM 56C Motor

Regal Rexnord - Marathon

MSRP: $411.13

Now: $317.69

Marathon Motors C334 1HP 115/230V 3450RPM 56C Motor FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $411.13

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Marathon Motors C331 1/2HP 115V/230V 3450RPM 56J

Regal Rexnord - Marathon

MSRP: $302.33

Now: $233.62

Marathon Motors C331 1/2HP 115V/230V 3450RPM 56J FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $302.33

Now: $233.62

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Marathon Motors G639 1/4HP 115/208-230 1800RPM MTR

Regal Rexnord - Marathon

MSRP: $656.62

Now: $507.39

Marathon Motors G639 1/4HP 115/208-230 1800RPM MTR FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $656.62

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Marathon Motors G143 208-230/460v3ph 1 1/2HP 1800RP

Regal Rexnord - Marathon

MSRP: $846.88

Now: $654.41

Marathon Motors G143 208-230/460v3ph 1 1/2HP 1800RP FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $846.88

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Marathon Motors D162 1/2HP 115V 1725RPM Rev Rot Mtr

Regal Rexnord - Marathon

MSRP: $464.19

Now: $358.70

Marathon Motors D162 1/2HP 115V 1725RPM Rev Rot Mtr FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $464.19

Now: $358.70

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Marathon Motors X016 1/2HP 115V 1625RPM 48Y Motor

Regal Rexnord - Marathon

MSRP: $383.87

Now: $296.63

Marathon Motors X016 1/2HP 115V 1625RPM 48Y Motor FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $383.87

Now: $296.63

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Marathon Motors X013 115v 1/4HP 1625RPM MOTOR

Regal Rexnord - Marathon

MSRP: $324.31

Now: $250.60

Marathon Motors X013 115v 1/4HP 1625RPM MOTOR FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $324.31

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Marathon Motors K277 3/4HP 208-230/460V 1725RPM Mtr

Regal Rexnord - Marathon

MSRP: $449.71

Now: $347.50

Marathon Motors K277 3/4HP 208-230/460V 1725RPM Mtr FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $449.71

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Marathon Motors K1408 1/2HP 208-230/460V 1800RPM Mtr

Regal Rexnord - Marathon

MSRP: $501.43

Now: $387.47

Marathon Motors K1408 1/2HP 208-230/460V 1800RPM Mtr FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $501.43

Now: $387.47

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Marathon Motors H175 115v1Ph 1/6-1/2HP 1140-1725RPM

Regal Rexnord - Marathon

MSRP: $637.07

Now: $492.28

Marathon Motors H175 115v1Ph 1/6-1/2HP 1140-1725RPM FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements

MSRP: $637.07

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Furnace Replacement Parts & HVAC System Components

Furnace replacement parts are critical to maintaining the performance and safety of any heating system. In both residential and commercial HVAC applications, a furnace relies on numerous components working together to heat air and circulate it throughout a building. These HVAC system components – from burners and heat exchangers to controls and sensors – must function correctly to ensure efficient operation and reliability. When any part fails or wears out, using quality replacement components (preferably OEM furnace parts) helps restore the system’s performance and prolong its lifespan.

Key HVAC Components in Furnaces

Blower Motors: The blower motor is an electric motor that drives a fan to circulate air through the furnace and ductwork. It pushes air across the heat exchanger to distribute warm air during heating, and also circulates air over the AC evaporator coil during cooling\. A properly functioning blower motor maintains airflow and consistent temperature throughout the space.
Ignition Modules & Ignitors: Modern furnaces use electronic ignition systems. An ignition module manages the sequence of operations for lighting the burner – it sends a spark or powers a hot-surface ignitor, opens the gas valve, and monitors the flame to ensure safe ignition. If the flame isn’t detected within a few seconds, the module will shut down the gas for safety. Hot surface ignitors (glow plugs) and spark ignitors work with the module to ignite the fuel reliably.
Limit Switches (Safety Controls): A limit switch is a temperature-activated safety device that prevents overheating. If the furnace’s internal temperature rises too high (for example, due to a blower failure or restricted airflow), the limit switch will open the circuit to shut off the burner. This protects the heat exchanger and other components from damage and is crucial for furnace safety. Many furnaces use a fan limit switch that also controls the blower fan on/off timing for heating.
Control Boards: Often called furnace control boards or integrated furnace controllers, these are the “brains” of the furnace. Control boards regulate key functions like blower fan timing, ignition sequence, and gas valve operation. In some systems, a control board incorporates the ignition control as well, managing everything from the inducer fan and ignition spark to blower delays. A faulty control board can lead to various operational issues, so replacing it with the correct OEM board is important for proper furnace performance.
Combustion Components (Burners & Sensors): The burners are where fuel combustion occurs to create heat, and they feed the heat exchanger. Replacing burners may be necessary if they become corroded or damaged. Additionally, flame sensors (or thermocouples in older units) are small but essential parts that detect the burner flame; if the flame sensor fails, the furnace may shut off the gas for safety. Maintaining these components ensures the furnace ignites correctly and operates safely.

OEM Furnace Parts and Compatibility

When replacing furnace components, opting for OEM parts (Original Equipment Manufacturer parts) is often recommended. OEM furnace parts are made by the furnace’s manufacturer or an approved vendor to match the original specifications exactly. This guarantees proper fit and function within the system. Using OEM replacements provides “guaranteed compatibility” and reliability with the existing equipment. In contrast, generic or aftermarket parts might save cost upfront but can introduce compatibility issues – they may not align perfectly with the furnace’s design, potentially reducing efficiency or causing malfunctions. Moreover, nonOEM parts could even void manufacturer warranties in some cases. In summary, genuine OEM parts help ensure that the repaired furnace operates as intended, sustaining performance and safety standards set by the manufacturer.

Furnace Parts for Commercial HVAC Systems

Commercial HVAC parts serve the same fundamental purposes as those in residential systems – moving air, igniting fuel, regulating temperature, etc. – but are often built for heavier duty and larger capacity. Commercial furnaces and rooftop units may use larger blowers, higher-output burners, and more robust heat exchangers to handle the heating demands of big spaces. They might also be configured as packaged units (especially in large buildings) where the furnace, blower, and AC components are integrated in one system. The parts themselves, however, still include familiar items like blower motors, ignition modules, sensors, limit switches, and control boards, just scaled up or reinforced for continuous operation. Using high-quality parts in commercial HVAC systems is critical: it ensures the system runs smoothly under intensive use, reducing energy waste and improving reliability. In fact, investing in quality commercial HVAC replacement parts can significantly enhance system performance and efficiency for businesses. Whether for a home furnace or an industrial heating unit, the goal in replacing parts is the same – to maintain safe operation and optimal heating performance.

Frequently Asked Questions (FAQ)

What are the most common furnace replacement parts?

Common furnace replacement parts include blower motors, ignitors (hot surface ignitors or spark ignitors), ignition control modules, flame sensors, gas valves, and limit switches. These components frequently wear out or fail over time. For example, blower motors have moving parts that can burn out, and ignitors are fragile and crack with age. Control boards and thermostats may also require replacement if they malfunction. Keeping these parts in good working order is essential, as each plays a role in the furnace’s ability to heat effectively and run safely.

How does a furnace limit switch improve safety?

The limit switch is a safety device that monitors the furnace’s internal temperature. If the furnace gets too hot – for instance, if the blower motor isn’t moving enough

air to cool the heat exchanger – the limit switch opens the electrical circuit to shut off the burner. This prevents the furnace from overheating and potentially causing damage or creating a fire hazard. Once the furnace cools to a safe temperature, the switch resets (on many models) allowing normal operation to resume. In short, the limit switch protects both the equipment and your home by acting as an automatic safety cutoff.

What does a furnace ignition module do?

An ignition module (sometimes called an ignition control) is an electronic component that controls the burner ignition process in a furnace. Its primary job is to light the burners safely. When the thermostat calls for heat, the ignition module initiates a sequence: it powers the ignitor or spark electrode and opens the gas valve to ignite the burner flame. The module also monitors the flame via a sensor. If a flame isn’t detected within a few seconds, the module will shut off the gas to prevent a dangerous gas buildupIn many modern furnaces, the ignition module is part of the main control board. A faulty ignition module can prevent the furnace from lighting at all, so replacing it promptly restores proper heating function.

Why choose OEM furnace parts for replacements?

OEM furnace parts are recommended because they ensure compatibility and original performance. OEM parts are made to the exact specifications of the furnace’s manufacturer, guaranteeing a precise fit and correct operation with the other components. This precise fit and high reliability mean the part will support the furnace’s efficiency and longevity as intended. By contrast, using aftermarket or “one-size-fits-all” parts can be a gamble – the part might physically fit, but it could have slight differences that lead to reduced efficiency or even system malfunctions. Additionally, OEM parts often carry better warranties and won’t risk voiding the furnace’s warranty. While they may cost a bit more initially, OEM parts often provide better long-term value by ensuring the furnace runs smoothly and reliably after repairs.

Are commercial HVAC parts different from residential furnace parts?

The fundamental parts of a furnace or HVAC system are similar in function whether in a home or a commercial building – both use blowers, burners/heat exchangers, filters, control systems, etc. The differences lie in scale, configuration, and durability. Commercial HVAC parts are typically larger, heavier-duty, and designed to handle greater heating/cooling loads continuously. For example, a commercial system might use multiple large blower motors or a bigger heat exchanger to serve a huge space, whereas a residential furnace has a single smaller blower for a house. Commercial units often use higher-voltage blowers or three-phase motors and may come as packaged units (combining AC and furnace in one rooftop box) for space and efficiency. Residential systems are usually split (separate furnace and AC) and lower capacity. Despite these differences, maintaining reliability and efficiency is crucial for both. Quality replacement parts are important in commercial systems because any downtime can affect many people and lead to high costs; similarly, in a home furnace, reliable parts keep the system running safely and efficiently. In summary, while the parts serve the same purposes, commercial HVAC parts are built for higher performance and tougher duty, and they must be matched to the specific requirements of the larger systems.